In COD4, I've been on level 55 for about a couple of weeks now, trying to get all the challenges completed before I go prestige and start all over again. Except, I noticed a few days ago, my challenges said DONE all the way to the end (even though I was not done yet) and I am unable to even try Prestige. I even have the gold-cross medal. Does that mean that my PS3 got hacked in some way? Is there any way of reverting this without creating a new PSN login? If so, what is it that happened so I can prevent it in the future! 

