BIOS UEFI Keys is changing

Hi. In bios my UEFI keys keeps changing from the default value, and the last key called DBX gets a status of MIXED instead of Default. The other ones said default, but the keys are changed from the default i mean if i clear all keys the default value keys are different to what i have before i clear them, and the DBX goes from MIXED to default. Does this have anything to do with Core Isolation being enabled in windows? What can be changing these values, i think i heard of some exploit changing these keys by hackers or something like that, is this what is happening or is it windows that is changing it because of a specific setting?

Windows 10 Pro x64 version 1945.2311

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EDIT: Now i restarted it was back to being changed from default, but i defaulted again and now i started windows and then restarted but it still was defaulted, so it seems it does it by someone or at a specific time interval. It's weird that it did not change from default when i restarted this time.

One potential cause of BIOS values changing is a defective CMOS backup battery. Usually a CR2032 coin cell battery on the motherboard.

fireberd said:

One potential cause of BIOS values changing is a defective CMOS backup battery. Usually a CR2032 coin cell battery on the motherboard.

I have changed that to a new battery for maybe 1 month ago

Restore the BIOS to the Default setting and see if that solves the problem.

Did you verify the new battery is good?

joeandmarg0 said:

Restore the BIOS to the Default setting and see if that solves the problem.

also did that, it did not solve it.

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fireberd said:

Did you verify the new battery is good?

Wouldn't it change all settings in bios if that was the case? All my other setting (and it's a lot for overclock) has never reverted or changed.

The intention of reverting to default is to erase all your changed settings.
Quite clearly you are not doing that as you state your overclocking remains unchanged.
Whichever method you choose battery or selection, either positively do it or live with the problem.

joeandmarg0 said:

The intention of reverting to default is to erase all your changed settings.
Quite clearly you are not doing that as you state your overclocking remains unchanged.
Whichever method you choose battery or selection, either positively do it or live with the problem.

Hi. No i have reverted all to default when i changed the battery.

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spunk said:

What is the Make and Model # of your Computer or Motherboard?
Please Confirm we are talking about the CMOS coin size battery on the motherboard.
When a CMOS battery is changed, it should set the Bios back to Defaults Any custom settings, including Time and Date, OC etc would need to be reset.

i7 7700k Maximus hero ix. All settings defaulted when i changed the coin sized cmos battery yes.