Specter permanently dies when playing wardloop builds.

I'm playing wardloop int stacker, my perfect pain artist got permanently killed a bunch of times during last 2 weeks, but today my perfect forest tiger got permanently deleted.
How it works: When your specter gets killed instead of turning into a ghost, the number counter of your specters on top of the screen lowers by 1. So if the specter icon shows the number 3, when your specter dies the number instantly shows 2.
Wardloop spawns a lot of minions every second (i use zombie of falling, summons skeletons and raging spirits). The game bugs and fails to turn specter into a ghost.
Another note, my pain artist and perfect tiger got killed at the same time. In hideout both of them were gone and instead i had one of the skeletons as a specter...