It would appear that you may have stopped the torrent at some point and restarted it. Once you stop a torrent, your torrent client will still acknowledge the full amount seeded from the beginning of it being added to your torrent client. The tracker however will only show how much you have uploaded on that particular session. Once you stop then restart the torrent, the session is refreshed and the tracker count goes back to 0. You would need to look at your overall ratio to be able to tell, but the problem comes in when you're dealing with numbers that are over 1 TB. 1 TB = 1024 GB, so it takes a while to make up the difference when the gap in the numbers is that large.
B