surviving person was the one deleted
First page indicated persons could not be merged because they had already been merged. When clicking on the surviving person, that was the deleted person.
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Found a line that was already combined but when going to the survived person it was the one that had been deleted and the deleted person was the one who was survived. Just a bit confusing.
See:
If you are coming to this through the Change Log, this can also happen if someone merged two people, undid the merge, the re-did the merge in the opposite direction.
If you post the ID of the deleted person who was the one who survived, I can probably sketch out the whole course of events for you.