qBittorrent official forums

Hello everyone.
I am using quittorrent on my raspberry pi 4.
I have forwarded the tcp and udp port for the qbittorrent on the router (I have public IP). I noticed that even when there are no downloads, even if I delete all downloads from the list, I see traffic to different hosts on the port, which I forwarded on the router. And I also see that from 70 to 99% of all connections on the router generate a qbittorrent. What is the reason?

To put it simply, i saw a lot of packets to differents hosts (tcpdump) when list into qbittorrent empty.