it shows that it has been snatched 31 times …. Certainly I should at least get the credit for the first upload
An avi the exact same size as yours has been available online for over a year, so it's possible that some of the 31 had that file already, and clicked Download in order to seed it.
The number you see in the Snatched column increases whenever someone downloads the torrent file only. It is not necessary to download the entire content itself for that number to change.