For me the page never shows an accurate number.
For instance now it says I am downloading 3 and uploading 1.
The reality is I have 5 uploading (which ok it might mean four of them have 0 leechers), and I havent downloaded 3 torrents simultaneously in like forever.
It sounds like you have torrents for which you have not downloaded 100% of ALL the files. When this happens, even though your torrent client says "Seeding", the tracker will still only register you as leeching the torrent, and thus, counts it towards your maximum simultaneous downloads.