I bought the two items requested for Quentin, and tried to submit, but got an error stating that I didn't have all of the items needed. So, I went back and bought them again, tried to submit a second time and got "oh no! You aren't on a quest!" Both items were in my inventory. That was quest 15, so I'm stuck with the items and put them in my shop.

no, I’d forgotten about it

Ok this was probably a site hiccup where it just needed to catch up. Please feel free to make a new board if this happens again.