Windows 2008 R2 Active Directory Domain Users being added to Administrators

I have a weird issue where every few hours, without an apparent reason, the Domain Users group is being added to the Builtin\Administrators group. Any idea what might be causing it?
Darek_DanielewskiAsked:
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TarekIsmailConnect With a Mentor Commented:
it seems like a GPO , and i think it is for Restricted Groups in your GPO.
example as attached.

SNAG-0001.jpg
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willettmeisterConnect With a Mentor Commented:
Soudns like you have a GPO that is modifying the administrators group.
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Darek_DanielewskiAuthor Commented:
Worked like a charm
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