Okay swapped the Prisoner on my team for the Raven Witch.. and the bug doesn't seem to happen.
But I've been running the same ATK team for weeks.
I hope I dont get it again! But if it helps, when it used to happen to me it was always a multi-hitter doing the killing blow, so I always saved up for a fury or a single hitter to finish things off.
Gringo-4930
MOFO
Currently grinding for:
Odin(s) - Freya - Scrooge (Slauki) Ed / Moar Yggs