I was seeding to 2 peers, same IP, one on port 36020 identifies as a Utorrent, the other on port 8663 is a qBittorrent. Both download same item in contemporanea.

Somebody plays torrent race, or is it something else?

I've seen this happening before.

Two users on the same internet connection (both WiFi, or both wired, or 1 wired and 1 WiFi) downloading the same file by coincidence, perhaps?

It's much more likely to be two people using the same VPN endpoint.