Unable to disenroll a user

Unable to disenroll a user

Hi
 
I am testing ADSSP and need to disenroll all of the users.
 
Going through Reports - Enrollment Reports - Enrolled Users Report and clicking the X works for all but one person, if I click the X next to this person it makes their detail change to bold text and doesn't disenroll them
 
Any ideas?
 
Thanks

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