It seems like you didn't provide correct launch images to your app. When there is no correct launch images set, the app will run like on iPhone 5/5S, that's why you are having these confusing results while logging. iPhone 6 screen size is 375x667 px scale x2, iPhone 6+ 414x736 px scale x3. So, if you want to set launch image for iPhone 6 it should have 750x1334 px size, and 1242x2208 for iPhone 6+ respectively. Good Luck!

EDIT:

As rmaddy mentioned in the comments, it's better to use launch screen storyboard with proper layout constraints to fit all screens, than having bunch of images for all screens(which also increases the app size).

Answer from Fahri Azimov on Stack Overflow
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Apple
apple.com › iphone › compare
iPhone - Compare Models - Apple
{IPHONE14PLUS} Buy · Buy · Buy ... more · Learn more · Learn more · Summary · Display: Screen Size · 6.3″ · 6.9″ · 6.5″ · 6.3″ · 6.1″ ·...
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EveryMac.com
everymac.com › systems › apple › iphone › iphone-faq › differences-between-iphone-6-iphone-6-plus-models.html
iPhone 6 vs iPhone 6 Plus: EveryiPhone.com
The displays are different, but they vary by more than the physical dimensions -- 4.7" (1334x750) for the iPhone 6 and 5.5" (1920x1080) for the iPhone 6 Plus. Both screens are multitouch capable, have IPS technology, are LED-backlit and have a 500 cd/m2 typical maximum brightness as well as ...
People also ask

How strong is the screen on the iPhone 6 Plus?
The screen is made of Gorilla Glass 4, giving you one of the most durable screens in a smartphone.
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phonetradr.com
phonetradr.com › buy › phone › apple-iphone-6-plus › faq
What is the difference between the iPhone 6 and 6 Plus?
What are the dimensions of the iPhone 6 Plus?
From top to bottom, the 6 Plus is 15.8 cm x 7.7 cm x 0.71 cm.
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phonetradr.com
phonetradr.com › buy › phone › apple-iphone-6-plus › faq
What is the difference between the iPhone 6 and 6 Plus?
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PhoneArena
phonearena.com › home › apple phones
Apple iPhone 6 Plus Full Specifications - PhoneArena
By today's standards, the iPhone 6 Plus' 5.5-inch display is petite, but ten years ago, it was ginormous compared to the 4.7-inch screen of the iPhone 6.Now...
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iSmash
ismash.com › pages › iphone-6-plus-dimensions
iPhone 6s Plus Dimensions: Everything You Need to Know – iSmash - The home of Cheeky Refurbs
The iPhone 6 Plus is a phablet-sized smartphone that was released by Apple in September 2014. It has a 5.5-inch Retina HD display, which is larger than the 4.7-inch display on the iPhone 6.
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Reddit
reddit.com › r/iphone › iphone 6 and 6 plus, actual size on your screen (includes keyboard)
r/iphone on Reddit: iPhone 6 and 6 Plus, actual size on your screen (includes keyboard)
September 12, 2014 -

Like many of you, I'm still having trouble deciding which size to get. I put together these images that display the two models at actual size, keyboards included.

Just open these at full screen on the device you have handy:

  • For iPhone 4S/4/3GS/3G/2G: iPhone 6, iPhone 6 Plus

  • For iPhone 5/5c/5s: iPhone 6, iPhone 6 Plus

  • For iPad mini 2/1

  • For iPad Air/4/3/2/1

  • For 11.6" MacBook Air

  • For 13.3" MacBook Pro/Air

  • For 15.4" MacBook Pro Retina

  • For 21.5" iMac

  • For 27" iMac/Cinema Display

Hope that helps!

NOW HELP ME DECIDE WHICH ONE TO BUY! AGH!


EDIT: Added 11.6" MacBook Air and 21" and 27" iMacs.

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Phone Tradr
phonetradr.com › buy › phone › apple-iphone-6-plus › faq
What is the difference between the iPhone 6 and 6 Plus?
The iPhone 6S has a 4.7-inch display with 1334x750-pixel resolution at 326 pixels per inch (ppi) and the iPhone 6 Plus features a 5.5-inch display with a 1920x1080-pixel resolution at 401 pixels-per-inch (ppi).
Find elsewhere
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AppleVis
applevis.com › forum › hardware-accessories › what-are-differences-between-iphone-6-6s-plus-it-worth-upgrade
What are the differences between the iPhone 6 and 6s Plus; and is it worth the upgrade? | AppleVis
Hi like Raul mention above The iPhone 6 or 6S the screen size is 4.7 inches not 5 as Raul says and the 6 Plus / 6S plus is 5.5 basically the huge differences between 6 and 6S Plus 1st screen size 4.7 vs 5.5 inches 2nd internal changes speed processor 1Gb vs 2Gb of RAM, A8 vs a9 cheap processor ...
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Wikipedia
en.wikipedia.org › wiki › IPhone_6
iPhone 6 - Wikipedia
2 weeks ago - The iPhone 6 was relaunched with 32 GB of storage in 2017 as a midrange/budget iPhone. From the launch of the original iPhone to the iPhone 4s, iPhones used 3.5-inch displays — which are smaller than screens used by flagship phones from ...
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Quora
quora.com › Does-the-iPhone-X-have-a-bigger-screen-than-iPhone-6-Plus
Does the iPhone X have a bigger screen than iPhone 6 Plus? - Quora
Answer (1 of 4): Yes and no the iphone x display is 5.8 inches compared to 5.5 on the iphone 6 plus,while on paper that seems the iphone x has a larger screen the iphone 6 plus is wider and has more usable space,so the difference isn’t much ...
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Digital Trends
digitaltrends.com › home › phones › apple › mobile › photo galleries › legacy archives
iPhone 6 vs. iPhone 6 Plus: An in-depth comparison of both new iPhone models
September 25, 2014 - Even though the difference in diagonal screen size is less than an inch between the two iPhone 6 models, this translates into a very noticeable difference when you hold the device.
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Ubergizmo
ubergizmo.com › products › lang › en_us › devices › iphone-6-plus,iphone-6s-plus
Apple iPhone 6 Plus vs. Apple iPhone 6s Plus Specs & Speed
Apple iPhone 6 Plus · 5.5" (1920x1080) IPS LCD · 2GB A8 SoC 16GB/64GB/128GB Storage · 8-MP, f/2.2, OIS 1 Rear Camera · 2915 mAh · iPhone 6 Plus News (150) iPhone 6 Plus Price $439. Search · Apple iPhone 6s Plus · 5.5" (1920x1080) IPS LCD · 2GB A9 SoC 16GB/64GB/128GB Storage ·
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GSMArena
gsmarena.com › apple_iphone_6_plus-6665.php
Apple iPhone 6 Plus - Full phone specifications
Apple iPhone 6 Plus smartphone. Announced Sep 2014. Features 5.5″ display, Apple A8 chipset, 8 MP primary camera, 1.2 MP front camera, 2915 mAh battery, 128 GB storage, 1000 MB RAM, Ion-strengthened glass.
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DisplayMate
displaymate.com › iPhone6_ShootOut.htm
iPhone 6 and 6 Plus Display Technology Shoot-Out
iPhone 6 Display Technology Shoot-Out · iPhone 6 and iPhone 6 Plus with the iPhone 5
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GSMArena
gsmarena.com › compare.php3
Compare Apple iPhone 6 vs. Apple iPhone 6 Plus - GSMArena.com
Apple iPhone 6 specs compared to Apple iPhone 6 Plus. Detailed up-do-date specifications shown side by side.
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CNET
cnet.com › tech › mobile › phones › apple iphone 6 vs. iphone 6 plus: what's the difference?
Apple iPhone 6 vs. iPhone 6 Plus: What's the difference? - CNET
September 10, 2014 - And that's no wonder -- the latter ... estate (5.5-inch vs. 4.7-inch) and weighs about 1.5 ounces more than its smaller sibling. The 6 Plus also costs $100 at each storage capacity than its smaller sibling. But the 6 Plus is much more than just a bigger and pricier iPhone 6. There are a few key spec differences: Screen: The 6 Plus isn't just larger -- it has a higher resolution (1,920 x 1,080 vs....
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IGN
ign.com › articles › 2014 › 10 › 03 › apple-iphone-6-plus-review
Apple iPhone 6 Plus Review - IGN
iPhone 6
Landscape mode is where the 6 Plus comes into its own, and makes it feel like more than a big iPhone. Holding the phone horizontally with two hands feels completely natural, especially as a kid who grew up on Game Gear. This is the first iPhone where the orientation of the home screen rotates, and it makes perfect sense at this screen size... It's not for everyone, but Apple's iPhone 6 Plus is the best big phone around.
Rating: 8.8/10 ​
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WIRED
wired.com › business › iphone › apple iphone 6 and iphone 6 plus review: in-depth analysis
Apple iPhone 6 and iPhone 6 Plus review: in-depth analysis | WIRED
September 28, 2014 - It's with graphics performance the differences between the iPhone 6 and iPhone 6 Plus become clear. The iPhone 6 Plus, with its 5.5-inch screen and Full HD 1080p display, has the same horsepower to drive it as the iPhone 6 has to power its 4.7-inch ...
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Reddit
reddit.com › r/iphone › size difference between 6 plus and 13 pro/pro max
r/iphone on Reddit: Size difference between 6 plus and 13 pro/pro max
July 21, 2021 -

I want to upgrade from my 6 plus to a 13 pro or pro max, but I’m not sure about the size. I love the size of the 6 plus and I don’t want to go much smaller or much bigger. The internet says the 13 pro is already larger than the 6 plus, but when I look at unboxing videos it looks significantly smaller so I’m unsure what to get.

Has anybody a 6 plus around and can tell me how the size difference looks in real life?

(I would just go to the store and look at it myself but I just broke my ankle and that makes shopping a bit difficult.)

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Quora
quora.com › Is-the-iPhone-6-Plus-really-big
Is the iPhone 6 Plus really big? - Quora
Answer (1 of 10): When I moved from a 5S to a 6 Plus, I was fervently what Brian Roemmele calls a "big phone denier". I was completely against it, but my wife and I have a policy of having the same phone and she wanted one, and I had a use case for which having a bigger screen and more pixels wa...