qBittorrent official forums

topic says it all. . .

It's an UNOFFICIAL fork of qBittorrent, aimed at the Chinese/Eastern market.
(see first item on list)

• Auto Ban Xunlei, QQ, Baidu, Xfplay, DLBT and Offline downloader
• Temporary IP Filter API for advanced user
• Update MessageBox with changelog if NEW version is available
• Auto Ban Unknown Peer from China Option(Default: OFF)
• Auto Update Public Trackers List(Default: OFF)
• Auto Ban BitTorrent Media Player Peer Option(Default: OFF)

They also use a different peerID, so most trackers don't have it whitelisted.
(see: https://github.com/c0re100/qBittorrent- ... /issues/70)

ps.: You should stick to official, unless you recognize those clients in the first point. Then you may need this fork.

Thanks Peter, I'll stay right here!