I was playing Brink about 30 min ago and joined a random multiplayer campaign on Aquarium as a medic.
After escorting the VIP almost all the way to the boat I noticed that for some reason I had 310000xp on the leaderboards,
and the game had only lasted for about 10 minutes.

So when the match ended I was instantly pushed up to max level from rank 3.
Is there any way for me to revert this and has anyone else encountered this bug?

This after the most recent patch? It may have introduced a new bug. I've never seen that problem before. You could always start a new character.

Just did, sadly though all the clothes that I "unlocked" came with it :/