So I decided to play today but didn't have any available wifi and played offline on steam. When I got home I logged into my account through the game and it erased all of my party progress. All gold/dlc etc. is still there. Is there any way to fix this or am I just boned on this?

Offline Gaming can have issues because the cloudsync... it should work so that when you got Connection it should sync, but there has been information about clitches in these forums.

Someone else wrote up something similar earlier.  I wasn't offline, but something happened to screw up my save also.  The one with three villains and whatnot.  Most frustrating.  Anyway, I just finished the scenario again, so I hope it takes this time.  Keeping my fingers crossed.  This is definitely something they should fix.  At least it isn't game breaking though.