Seems like there's a problem here? From looking at a couple other users, Petr's rating is also wrong.

BTW look at my graph for the real rating (2418).

EDIT: Azret linked a blog in Russian, it seems these might actually be legit :O

http://codeforces.net/blog/entry/44168?locale=ru#comment-287807

EDIT later: ok it's varying a lot, and apparently something is changing!