Torrent client, qtorrent, has web GUI.
Torrent client on one server with unique ip address. Nginx reverse proxy setup with unique ip address.
Have setup Nginx reverse proxy to point subdomain address internal ip address with specific port (traffic HTTPS via letsencrypt).
Can load Torrent Client GUI login page, but no page formatting (images provided below).
Can access Torrent Client GUI when on local network, via local ip address:port.
When login details are entered in site (that is accessed via domain address sub.example.com), a blank white web page is loaded and the web address changes to "https://www.sub.example.com/?username=UNameExample&password=PASSWORDExample"
Any advise on where to confirm or check configurations.