This is probably due to the update...sometimes when an update comes through some of the people who were unbanned just before the update get cycled back into the system. Advisors do not look at this folder for unban actions, so please go to the contest ban folder, post a new thread with your user name and SteamID, and in the reason, just say you had been unbanned and now you are banned again. They will take care of it from there.
Thanks!