As per your clarification that you simply mean the jumper is missing, to my knowledge on the majority of modern motherboards, this simply doesn't matter. The two pins that you bridge to trip the RTC clear are wired, but the third pin doesn't really do anything and is simply there so that the jumper can remain in the machine.
That said, for the issues you're having it couldn't hurt to reset the CMOS and then immediately do a clean flash of the newest BIOS revision and reset your settings from scratch. In the absence of a jumper, you can simply bridge the two pins for a few seconds with a screwdriver or pocketknife.
Answer from Shinrai on Stack ExchangeQuestion on what pressing the CMOS button actually does. - PCPartPicker
Question on what pressing the CMOS button actually does.
My ASUS ROG STRIX B450-F GAMING Motherboard HAS A PROBLEM
Clrtc - Republic of Gamers Forum - 730503
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Hi, please help to pinpoint where and which is the CLRTC header, it should be 2 pin right? I am confused, here is the image https://imgur.com/a/uwkDhbc
Thanks