My Pet Dungeon Wave 9 - Disciples Damaged

Of the 30? disciples that spawn with the level 9 wave (on every map but Snowhope), 20? appear to spawn with damage, and fairly quickly loose all their health & die. This means that if they have far enough to travel before reaching your defences / dungeon then the force arrives much diminished.

It seems like they may not be attatched to their Matriarch properly.