Spoowner

Hi, I am not sure what is happening, but I did this quest yesterday and when I have logged in today, the quest appeared again.. But NO WAY the requested (tried more than a hour) 'Glowing Soul Gem' drops from the monsters... It is a very strange bug, I could take the child quest and the quest itself, as you can see below: Parent already done, but impossible to drop the item and do again: The child quest (not done yet) : How to solve it ? Thank you!

Ok man, thank you!