One thing you might want to check is whether you have a lot of torrents that you've intentionally downloaded part of but not all of. If you choose to just download some of the files in a torrent you can end up showing as a 'leecher' of that torrent and you get treated as if you're permanently trying to download it.
On the main site, if you click the up/down arrows on the top bar you'll be taken to a page of statistics about yourself. If you then click 'show leeching torrents' at the bottom, you'll see the list of torrents that the system believes you're downloading. From your torrent client you could remove some of those if you're not trying to download any more of them, and that might free you up.