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Unable to login to router without an active VPN-connection

I unable to connect to my router if I don’t have a running VPN-connection !

It’s like “a reverse problem!!” (Logic defines that an active VPN-connection most probably WOULD hinder a login to any router, -yes?):

When:

VPN on =

I’m unable to connect directly to http://10.0.0.138 without an active VPN (Proton) connection

VPN off =
Attempting to access 10.0.0138 I’m “forwarded” within seconds (5?) to www.asusrouter.com – which offers no router-login page…

I’m not exactly “green” – but can’t figure this one out as I can’t find (or figure out) any good searches for this… help!