don't add other trackers to torrent from any private tracker. The thing is, that your torrent client (e.g. uTorrent, vuze) reports stats back to the tracker and the tracker then counts them in your account (e.g. bitspyder account). When you added more trackers to the torrent, you uploaded data not just to bitspider users, but to users from other trackers too. Since your torrent client probably reports only summary (total downloaded data, total uploaded data), you reported back to the bitspyder that you uploaded to bitspyder users more then you actually did (you uploaded only part of it to bitspyder users, the rest was to users from other trackers). Hence you altered your stats in your bitspyder account in your favour, hence you were cough as a cheater.