A thread I made got deleted, but I got a warning for an unrelated post that's not even mine.

I had a thread in Player Behavior that got deleted last night. I checked my messages and I received a warning addressed to a completely different user for a post they had made in Gameplay, saying that his post would be deleted.

That completely unrelated post was never deleted, though, and my thread's gone for reasons I'm not sure of because I got no warning pertaining to it.

What sort of bizarre forum magic causes this to happen?