It's bugged yes.
Invino's solution is better than mine, but i will explain it anyway:
You start the quest, then, 2 mobs will come to you, and you kill them. And the trick is to log off from the game, and log in again. After you relog, you can pull the 2 mobs that are stuck, and move a little close to the quest giver to kill them. The next couple of mobs will spawn & run to you. You kill them, and the quest is complete.
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