Ported back to start of game and can't use fast travel

Was attempting to use the Campaign Matchmaking System and the game ported me back to the start of the game. I can’t fast travel anywhere, even though I just finished Athena.

I sort of had a related issue as well. I started a solo campaign, then went into a co-op campaign with my friends, but when I went back to my solo game, everything was overwritten on my character from the co-op game.

Also looks like all my progress is gone. Game is making me redo all the missions I have completed.