Boss Bugged

I started defeating Zelina, but she stood still with 0 health bar, instead of falling to the ground. Then I defeated Zolin, he died and dropped the loot, I even summoned Doryani and finished the quest, but suddenly Zolin revived with 0 life while I was speaking to Doryani, and he kept following and attacking me throughout the map, he literally left the boss area. I honestly didn't glitch or anything, just defeated both normally, I've no idea how this happened