My GT is Ix SCIO xI. I was lvl 24 and ranked between #200-300 in the world leaderboard for xp and after recovering my gamertag at a friend's 360 n having a good session, my rank just reset itself and I've lost everything. Any idea what I can do? I haven't played a match yet, don't wanna risk any permanent changes.

Yeah this happened to me as well, except the only thing I did was move my account from my Hard drive to my USB stick since that's where I had installed the game on my 360. While I didn't rank super high, EVERY SINGLE TIME I log in, I have to start over, its driving me NUTS!