At this point, I cannot reproduce. I was in the city when the tourney ended, received the notice that it had ended. I exited the city, came back in and did not receive a 2nd notice. When the notice of prizes came in, I again exited and came back; but there was not a second notice.
If this has happened again today, please make out a formal bug report that shows your browser, HTML/Flash, etc. I was using Chrome with HTML.