User Acct. is being removed from AD group.

I have added a user account to a Global group, and twice I have found the next day, that the account has been removed from the group.  I have Auding enabled, and have found the Event ID 633....

Type:      Audit Success
Source:      Security
Event ID:      633
Event Time:      9/16/2010 8:21:18 AM
User:      NT AUTHORITY\SYSTEM
Computer:      Pri-DCSVR00
Description:
Security Enabled Global Group Member Removed:
      Member Name:      CN=Joe Blow,OU=Contractors,OU=Technology Department,OU=STL,DC=acme,DC=com
      Member ID:      %{S-1-5-21-1814976544-1464880352-2118856591-5839}
      Target Account Name:      Test_Consult
      Target Domain:      Test
      Target Account ID:      %{S-1-5-21-1814976544-1464880352-2118856591-5712}
      Caller User Name:      -
      Caller Domain:      -
      Caller Logon ID:      (0x0,0x92837100)
      Privileges:      -

I am lost by the "User" that is removing the account from the Group, that user being "NT AUTHORITY\SYSTEM".  Is there a way to find out who or why this is getting removed?
mbigognoAsked:
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Mike ThomasConnect With a Mentor ConsultantCommented:
It is possibly being removed by a group policy.
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Mike ThomasConsultantCommented:
And do you really have a contracter called Joe Blow? cos that's a cool name. ;)
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65tdCommented:
I'd be leaning to a GPO as well, look in restricted groups.
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mbigognoAuthor Commented:
Sorry it took so long to get back.  Had another administrator mucking around with group policy.  That was the fix.  Thanks.
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