This is closely related to this question.
It seems my "nice answer" badges are out of sync too, as in the related question.
Except for some maniac tendency to tidiness, the whole matter doesn't disturb me that much :), but I think it may be related to a "nice answer" badge I received some time ago, and the question was subsequently deleted. I don't have a pointer to that question, but perhaps the developers can trace it from my "nice answer" badge board.
Although this issue is already known, I am reporting this as a bug just to inform about the possible correlation among the deleted question and the out-of-sync.