The last torrent that the site shows that you uploaded was uploaded over a month ago. What I suspect that you're seeing is the session total that the site displays, which will only show the upload amount of the current session. Any time the torrent is stopped and started again, this session total will reset as the totals have already been added to your grand total counts. The values that you see in your torrent client on the other hand are the grand total that you have transferred in all sessions since the torrent was added to your torrent client. Also, the totals in your torrent client also reflect the total amount transferred including network overhead traffic. For this reason, there may be a slight difference between the grand total in your torrent client and the grand total reflected on the tracker.