I've seen things like this before on TL where there are a lot of partial seeders. A partial seeder is someone who's configured their client to only download some files from within a torrent, but not all. When that happens it looks like there's a lot of peers in the torrent relative to the number of seeders, but nobody is downloading so you can't upload.

Check your peer list and see if there are a lot of people with most, but not all of the files who aren't downloading anything.