Not a problem, sir. [takes out a hamster from behind the counter] If you could just press the N0 button and tell the little hamster you are not going to come back. Just look him right in the eye, sir, and say "Not today, buddy."
Probably not neccissary to say but yes the categories were removed by mistake, I've tried to avoid categorising my Sandbox in case I forget to clear it out and must have overwritten everything on the page including the removed categories.
I would like to personally apologize for your accidental ban. We saw you were adding extra categories but you should've been giving a warning first, then a ban. Well now you're unbanned from both the wiki and the server and I'm very sorry that this had to happen.