I'm not deleting old data in real time automatically as discussed in a few other threads... it gets deleted after a period of time just in case it's caused by the project servers themselves..
You can always tell, because the users aren't included during ranking, thereby showing multiple rankings of the same number...in some places I parse these out in the php, but not everywhere.
I've ran a manual delete of old rc572 users though, which will propagate to the live tables within 30mins or so.
Bok