Yeah ... don't use LW for torrents O.o Unfortunately LW is not totally geared properly for full torrent understanding.
I'd recommend Azureus (now called Vuse).
One of the problems is with torrents is some hosts set high share ratio requirements in order to connect to them. LW does not seem to keep any track of ratio of sharing. I'm guessing a lot of people lose out by being filtered out by such high requirement sharers. (I keep my share ratio well over 2 ... meaning more than double uploaded compared to downloaded.)
That at least affects things with connecting to the best of the sharers.
For the rest, it is a wide topic. Torrents are very much partial file sharing. So you were probably downloading at same time as some others who still yet did not have the entire file. Their upload slots might have been taken by others or other shares they have. Patience is best for torrents.
I hope that makes sense.