I think minecraft on my xbox 360 has been corrupted?

Ok so all the worlds that I have are still there, but every time I load one, it starts me off in a different biome and everything that I've done on that world is gone. This happens on every world I get on and it starts in the same biome each time with everything I had gone. Is there any way I can get everything on my worlds back? And please be detailed with step by step instructions, thanks.

Does Xbox have a ram or flashrom personal cartridge of some kind that stores your saved games? And even if it does not, does it save games? If so, THAT may be what is corrupted or damaged (whether it is a removable item or not)