Re: A bit of ghostly help
Do you already have some in your inventory? The ghosts won't drop more if you already have 5. If so, delete the ones you've got already and try again. Might have to retake the quest, too
Re: A bit of ghostly help
I've updated this quest for now so that you loot 10 Ectoplasm maximum instead of 5 maximum just in case anyone loots one beforehand.
These ghosts normally don't drop this ectoplasm; it is generated by the quest itself. So if you had any ectoplasm beforehand, it can bug out the quest and not allow you to loot the 5 you need for that step. That's generally what causes the issue you are having.
I'll bring this up internally to see if it can be done any other way since it seems a lot of new players seem kill these ghosts before the step that needs you to, causing issues later.