Are you sure you chose upload speed to curb bandwidth at? You may have chosen download bandwidth above it by mistake.

Torrents: I do not use torrents with LW, however 'if' you are downloading torrents then LW will share them at a particular ratio or attempt to. I've a suspicion your problem is with torrents & not files from the gnutella network.

As for the file that appears to have problems, is it a torrent file or a file from gnutella network? Torrents & gnutella network work in a rather different way.