Good question David.
My initial feel is that this should be a bug. Once your activity in a tournament is over, your inclusion should be over as well. I would perhaps bring this up with the staff to see if it is something they can resolve.
Otherwise they may be able to do something for you personally...
But this really does smack of something that should be fixed for everybody, unless I'm not understanding something correctly.
I play in lots of different tournaments, and typically finish somewhere in the middle of my bracket. I never advance but that is ok with me, I enjoy the challenge. But now I am about to reach my limit of 10 tournaments at a time and I am realizing that I am still involved in tournaments that I will never play another game in and have not played a game since March. My question for the community and it's staff is: is it frowned upon if I drop out of these tournament that are over for me but not over for others? If it is ok, then when is the polite time to do so? Thanks, David