It's a bug (pun intended) I think. First time, I did this quest (1 tank, 2dps, 1 heal/dps) we were wiped out continuously as the queen spawned waves and waves of collocoids. Another try with 1 tank, 1 dps, 2dps/heal, the queen only spawned one wave of the collocoids.
If you are having a problem, phase out and phase in.