Campaign playlists bug

All my playlists in mcc got reset back to the first mission. I wouldn’t be too mad but I was on the 8th mission in the halo 2 laso playlist. How come you can’t pick the last mission you was on in the playlist? It says I completed the first 7 level but I can only start it on mission 1. I am fairly mad (I want to throw my xbox through a wall). 343 please help

When i try loading the normal halo 4 campaign my game always crashes.