ACT III Cruel - Sandswept March - Bosses not ticket off

Sandswept March, cleared it twice, still isn't ticked off in the map.
How i expect the bug to occur, i killed one of the bosses, ran through the map found the entrance to Encampement, went in talked to guys, unlocked the waystone. then went back(for whatever reason my instance got reset), so had to go through the whole map again. this time finding all bosses and hanging tree(which seems to work). Cleared everything except some regular mobs here and there.

Didnt work, tried to reset manually this time and do it again, didnt work. So something isn't working correctly(it's just visually not registered as i have killed the bosses, even though i have done it multiple times now.)

Thanks.