I don't know how to repro this...

I created a campaign. I created my own pre-made characters. Added them to the campaign as unassigned.

A player tried to claim one, and got an error saying it was already assigned.

Now that character is nowhere:

* Not in the campaign as assigned OR unassigned;
* Not in my character roster
* Not in any of my player's character rosters.

Has anyone ever seen this before? I searched a bit and saw what might be comparable scenarios, but in those the characters were, at least, *somewhere* ...

This seems like a strange bug to have. 

I didn't have time for that. It was an hour before game time. I just rebuilt a new version of the character.