I'm not sure when this happened, I've been going back and beating all the scenarios on legendary with Solo Lini for awhile now, but yesterday I got a daily quest to beat a mission to Seoni and when I went to switch her in she was gone. The only experienced characters I have now are Lini and a level 1 Amiri. Previously I played through the entire campaign with Lini/Harsk and then have been slowly taking every character through the scenarios so I had every single one at least with B/1 complete but they are all gone now. I've checked both my mobile phone and bluestacks to make sure it's not a syncing issue but both are showing the same information.