Diablo 3 coop overwrote single player game to older save

diablo-3

So long story short, I was near the last episodes(?) of ACT 2 when a friend invited me to a coop game. When I was done, I quit, went to the menu and hit resume and when I go in, it started me ALL the way back in ACT2 episode/chapter 1 when you first get to the city.

I go ahead and manually start the last episode I was on in act 2 but it literally took away all my last items, maps(uncovered/traveled to), equipped items etc..

I still have all my powers and slots that I set them to but essentially I'm going to have to redo all of the last missions I did before I joined that game.

My question is, is this a bug? Or something deliberate (which I highly doubt).
It upsets me because now I'm paranoid I'll lose data when I join someone else's missions.

Any one experience this or something I did wrong? I mean I always quit the same way so not sure whats going on.

Best Answer

If you go to "Change quest" on the main menu, you can change it to the quest you had been on when you left. You may lose a small amount of progress, but it isn't much.

See this related question for more information