ODST Co-Op Restart

I’ve recently started playing ODST on the master chief collection with a friend of mine. We made it to the sixth mission and decided to stop for the night. Because we are playing co-op our mission always restarts, but the past few nights we’ve been playing it always restarts the campaign. I always hit “quit” as opposed to just closing the game out. it restarted us 3 times last night. Does anyone have any solutions or is anyone else having this problem?