Are you supposed to bend them yourself so they go inwards over the ports? I'm going to have to have to remove the motherboard to fix it...
What should I do with the sticking out I/O shield tabs?
How do I adjust the tabs on an I/O shield? | AnandTech Forums: Technology, Hardware, Software, and Deals
I/O Shield Tabs, what the hell do I do with these? | AnandTech Forums: Technology, Hardware, Software, and Deals
What's with the metal "prongs" on this motherboard IO backplate - Hardware Hangout - Neowin
I/O shield:

1) Shield to keep electro-magnetic radiation inside of the case
2) Dust Cover / Air circulation director: The fan in the power supply shall draw air throughout the entire case and not just along the short way from the I/O area to the power supply that's usually right above.
3) Aesthetics: No ugly hole.
It's simply for covering the back of the computer, and for shielding your inputs and outputs from being jarred around and damaged when you're plugging in and unplugging things. Some people on this thread seem confused. Because it has "shield" in the name, people think it's shielding against current or EMF. It has nothing whatsoever to do with current, or EMF interfering with radios or anything else. I use radios, I also have no covers on my computer, side front or back. To add to that, the radio I have right now is inside my computer. It's really only aesthetic, there to look good because as a shield for your inputs and outputs most of them are fairly useless without being actually attached to the board and solid rather than thin and flimsy.