Does your VPN provider allow port forwarding? That’s probably the answer to this. Forward a port through the VPN provider and set the qBit listening port to the same.
The seeders and leechers number is pulled from trackers (I think?) but doesn’t accurately represent the numbers available to you unless you have port forwarding set up properly.
Edit: just my 2 cents if your provider doesn’t offer port forwarding, I use AirVPN and it’s excellent. Great speeds and it offers everything I need. My only complaint is that the website is confusing.