I get numbers instead of the sid in my GPO settings for users/groups

not trying to confuses anyone so I'm making a new tread I'm getting errors in My BPA for MY 2012 r2 DC and i have trouble shooted it and found that it cant resolve a SID number. Now My question is this I been reading that when you see Numbers instead of the User name its because the account has been deleted. I then Read that it could be account that is corrupted. SO I have searched and Searched for the SID in My ADUC i used the PStool SIDTONAME and I cant find anything to match that SID so is it safe to remove it from the GPO Settings