Why would an "Edit Record" fail due to a duplicate record?

Hi, I have a function stack where one of the steps is to edit the "user_profile".

The step keeps on giving me an error saying that a duplicate record was found. Now thats impossible because I'm using the "user_id" field to lookup the record, and in that table its set as an index that doesnt allow duplicates.

So how could it possibly fail due to a duplicate?

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