Duplicate Requestor

Duplicate Requestor

We had an issue with our email server and since then, we have duplicate requestors with different login IDs.  The original lists their AD profile/user IDs.  The duplicates have their email address listed as their sign-in ID.  In addition, a large number of Dist Lists also came over as Sites.
 
I went through the entire list of Requestors and deleted the duplicate entries that were wrong and did not contain all the information (Site, Dept, etc).  When I view the list of Requestors, there are no duplicate entries any longer.  However, when Incident tickets are created, it is not auto-populating the fields it should.  If I click on the user id icon next to the requestor's name, there are still two entries listed.
 
How do I permanently remove these extra entries so they do not show up anywhere?
 
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