STOP USING NORDVPN
In short: This makes you an awful seeder, a poor downloader and negatively affects your transfer speeds.
NordVPN is deliberately NOT suited for Bittorrent usage. Bittorrent like almost any other p2p protocol requires YOUR COMPUTER to be readily available to new requests coming from the Internet.
With NordVPN THIS IS NOT POSSIBLE, bad! If you have a 100% download and you are the only seed online, another person with 0% download CANNOT connect to you, because NordVPN deliberately does NOT support port-forwarding. It's this port-forwarding that's crucial for Bittorrent and adequate transfers.
- here they openly admit they do not offer port-forwarding with a lame excuse.
Find a VPN provider that supports port-forwarding and setup the client to use that port assigned to you.