Me and a buddy completed the first 3 missions in the first episode of Spartan Ops on Legendary, and the 3rd mission shows as not being completed at all. Just reporting the bug and that is that. Back to gaming.
EDIT: It shows up now.
SPartan ops is bugged right now. all you have to do to show a spartan ops game as completed is start it, then save and quit right after it starts. You get the cheevos too.