Okay, this is fixed now.
In future, it would help to reply at least somewhat timely. I know, we're all incredibly very truly busy 24/7, but even I manage to scrape up a bit of time to reply and talk to others. :3
My confusion came from the fact that things could not have happened the way you described them, due to how the coding works. With that, I could only make a few stabs into the dark. And your bug report was indeed wrong, because the completion message did not show up - it was the message you see after accepting the quest. Those things make a huge difference, and knowing that would have pointed me straight to the glitch.