When looking at the History of Changes tab in a Faculty/Staff record you see that the Record ID is being added by Synchronization User.
We are currently evaluating this issue and will update this article when we have more information.
Steps to Duplicate
1. Set up Automatic Synchronization 2. Run Synchronization 3. Check History of Changes tab 4. See User Defined ID has a previous setting of "blank" and a new setting of the ID. (There is no record of the ID being deleted)