Custom URL not working from local network

[mikamir12]

When I'm out not in my local network my custom url works perfectly fine, but when I'm in the same network as my subsonic server it redirects me to the wrong URL.

When I'm in my local network and try to connect to XXX.subsonic.org it redirects me to 10.8.0.1:4040, and this is the url of the VPN (I run OpenVPN on the same machien). This also happens when I stop the VPN service.

Does anyone know why this happens and how I can fix this?