Silent cave boss bugs so unable to complete map for atlas points

This is the second time I've come across this map and again am not able to complete it as the imprisoned boss monsters are bugged out and I can't free them for the fight. The first two bosses as you go in do work but not the other three bosses.

I've tried going to hideout and back and also to inviting a friend to join party and go in to see if they can break the imprisonment but none of it works sadly.