For future reference, resetting your tracker key does not usually improve your seeding. If anything, it'll typically hinder it, and is normally used to fix the situation where you accidentally leak your tracker key and someone else has taken it for personal gain (i.e. if your tracked stats start increasing too quickly).
Are all of your torrents showing messed-up stats? Usually such an issue affects all torrents at once but for your case it seems torrent-specific, as some torrents show a few GB seeded.
Messed-up stat tracking can sometimes happen when you add a large number of torrents at once and have them all leech at once. The heavy download traffic can sometimes interfere with your tracker updates. My stats are generally spot-on but I noticed this happening before when I added some 50 torrents at once.
