A little problem

Hi there, I just wanted a little help on something. I completed the Halo 4 campaign on legendary, got the achievment for it and all but in the commendations section it shows that I’ve only completed the second mission (which I think is the only one I completed while online) and so I don’t have the master chief armor. When I try to replay the first mission, it loads up to about 92 or 93% then skips to 100%, then goes back to zero and starts again, saying that I’m missing content. Any ideas?

Try installing the disk onto your xbox that might help