Larva

Checked. The larvae belong there: they are the brood of the Queen Klawtinel nearby, and the official game places them in the same spots with the same health and the same 20 m at which they notice you. So we left them as they are.

I think the problem is that the Queen wasn't nearby. If she were, it would be fine. I need to check where she spawns, but while I was killing all the mobs near those larvae, the Queen was over on another island.

Checked. The Queen is where she belongs: every sighting of her on the official servers is within about 13 m of her spot, on her own island, and she does not walk around. The larvae on the other island are there without her on the official servers too. The ones that belong to her hatch from the eggs she lays during her own fight. So those larvae are meant to be there on their own.