Campaign progress and terminals lost.

So I have beaten Halo 4 twice on Heroic. The second play through I found the rest of the terminals I needed. I was going to start a Legendary play through but I noticed that when I went to start the game I was only able to select the prologue. I went on Halo waypoint and it says I have completed the game but all of the terminals are locked. Has this happened to anyone else? I also don’t want to beat the game on Legendary only to lose my Mark VI armour and have to do it all over again.

This happend to me to. Really annoying when I was ging to play the campign to get the last few achivements I have left.