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So I'm not using Mullvad but I followed these instructions changing the main vpn connection to use wireguard settings of my provider and the tunnel seems fine. However, I'm receiving an error on any website I try to visit telling me its not secure, click advance continue and it gives an opnsense rebind dns attack error page. Any suggestions on what it is causing this?

I should add, when I do a ping test to like 8.8.8.8 it says I'm getting a reply from my opnsense IP address of 192.168.1.1  , so clearly something isn't right there but I don't know what.