Mob spawning in Northrend

I've noticed that some of the quests here in Northrend is a real pain to complete, cause of the low mob spawn rate here. I don't know if this is intended, or if this perhaps is a bug. The quest I'm struggling with right now is Soft Packaging in Dragonblight. It requires me to kill 12 mobs, but there is only 2 mobs that spawn and I have to wait for them to respawn over and over again.. I know that the mob density was larger on retail, and it really bugs me out that there are so few mobs on this server. It makes it even harder when we are around 3 people at the moment which are trying to do the same quest, and the other 2 are horde players and I am alliance...