Wilsa emigrated.
When?
The more specific you can be, the better. This is almost certainly caused by a crash within the emigration process—which, to make sure not to lose characters, creates the new one before it deletes the old one. If you can pinpoint when you went through the initial emigration process, I may be able to nail down what the error in the code was that caused this.
As far as what to do about it...I'd have to take a look at the two characters, and see if one of them looks incomplete, because it's quite possible that some stuff didn't transfer properly to the new one.