I think this is a regen / damage intake issue.
A bug exists where spells such as regen hurt the person with the spell on them. Such that an npc when they cast regen on themself, will attack themself.
I bet Dark Pact or any spell that is suppose to take health away is causing the npcs to agro on themselves as they are taking damage, as you have said. I assume both bugs are related.
~Timba
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