I'm not sure where to post this, because I don't know what is going on.
I downloaded and installed qbittorrent_4.6.0_x64 yesterday (Oct. 23rd) and I found I suddenly had a *large* number of torrents (from *different* sites!) that ALL have Seeds and Peers numbering 666!
I know it is near Halloween, but what the heck?!
So I reinstalled version 4.5.5x64 — and things went back to normal.
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You even posted there. It looks like a tracker is sending back this false information/number.
There is no "666" in the qBittorrent or the libtorrent source code.