Earlier today I was doing IB with another player when during our third match set up, I was looking through the list and saw that while I was on it, my fireteam member was not. It showed that I was in a fireteam but I was somehow solo in the matchmaking. If I hovered over my name it would show all of the fireteam members, but again, the other was not there in the list. As it turned out, when the match started, I entered a match on Frontier while he was sent to Pantheon. Keep in mind still we were still considered to be in the same fireteam at this point. We complete our respective matches, then at the rewards screen, my fireteam leader started moving to orbit...which somehow brought me out as well, probably because we were still technically in the same fireteam. To top it off though, the match I completed did not register in the Match Complete section of the IB weekly bounty I was working on.