Yes sounds like none of remaining ones have the remaining segment & like you are awaiting for someone with the last part to come online.

I use two torrent programs. Main one is Vuse (previously called Azureus) & this year use Transmission (Mac OSX only) for one specific private torrent site. For windows either Vuse or the much simpler uTorrent are good ones. Vuse has more advanced features, plus can be used in either Beginner, Intermediate, or Advanced levels as set in preferences for more options.