I have two xboxes, and I switch back and forth between them fairly often. I gave away my newest one to my brother (with internal memory), but I figured since most of my games were saved onto my older one's hard drive it wouldn't be a problem. I turned on my old one, which I have played a very limited amount of MW3 , and tried to load survival mode, but it said that I was only level 22. On multiplayer my level was correct. The main screen said that I was 88% complete in survival, so I knew that wasn't right. I can't remember what level I was exactly, but I know I had unlocked all the levels, so I knew I had to be above 25, and I have the achievement for buying all the items in the equipment armory, which required you to be at least level 37.

Is something wrong with my account, or is your progress just saved locally? Is there anything I can do to retrieve that progress?