Lake rathe deepwater goblins not there.
 

I was camping the corrupted goblin shaman in lake rathe and the two phs aren't showing. I see them in track, but nothing is there when i go to them. I've killed bergergle's placeholder 4 times with nothing else spawning.

Ah this is an old issue. Once pulled out of their cave, the mobs have difficulty pathing back into it. When this happens they will be up above their spawn points chilling on the lakebed above the cave.