Zombyfycation lets me summon a lot of zombies, but from time to time casting it kills most of them. It's quite frustrating to have that happen when I'm at eight zombies and trying to raise three more with the last scraps of mana left, only to end up companionless and out of mana.
Looking up several wikis provided me with texts that said the spell only allows a single zombie. This is confusing, because either there is a very obvious, game-breaking bug in the main skill of the Fleshsmithing tree (highly unlikely with any sort of maintenance on the game), or the texts have not been updated. The spell has a range of 3x3, which also makes no sense if it was meant to only raise at most one zombie.
What is causing the dispels, and how should I prevent them?