At least now your numbers have considerably gown up …
Are you sure it were 200 MB and not 200 KB? With uploading an own torrent a jump from 200 KB (from seeding back downloaded torrents with low demand) to 800 MB is very possible.
The tracker adds upload and download to the totals. Negative delta between two announcements by your client are very unlikely (never seen that, except cheating clients and here for download only >:D )