I have a problem with some quests:
Repeating level6 over and over does not help. The game does not recognise I have already done it. It happened before with another map, but I decided to skip for 5 rubies. Now it is 40 rubies and it seems to repeat. Any ideas?
Not sure if you ever solved this, but the same thing happened to me and the solutions was to A) Be in Normal mode, not Hard (as I see you were) and B) Actually do the fight..Don't use Quick Fight.
Once I did that it registered on the Quest :)