Halo Reach Problem

Okay here's the problem on why I am not going to be on Xbox until this is solved. For some reason I went to exit on Xbox Dashboard during the Halo Reach loading screen, then when I came back, things gliched up for some reason like the Campaign restarted back to the beginning, etc. Then after I was just playing on "The Pillar of Autumn" which by the way I have beaten that on Normal, then when I was done, even though I'm a Commander (rank), It shows that I'm recurit. Anyone help me on how to get rid of this problem?