5 dollars say your torrent client wasn't using the VPN.

And/Or DNS resolver leak (not using dnscrypt)

Use this [0] to find your Torrent Clients IP address. It downloads a torrent where the tracker description echoes back your IP. I've found VPNs to be too unreliable and only use a seedbox now.

[0] https://torguard.net/checkmytorrentipaddress.php

There are some extra precautions you need to take to anonymize your traffic on torrents, like forcing encryption with a socks proxy in addition to running the VPN.

Which means your VPN service is telling your IP to authorities, which makes it not secure, which brakes the purpose of VPN service