NextDNS is not working at all

I have tried everything I know of. I have the service running (both of them), I have NextDNS on my ASUS RT-BE92U in the WAN settings, I have the latest version of Asuswrt-Merlin, I have used the CLI to auto configure the router. When I reboot I can't get back on because it says that the DNS settings are preventing a connection.

Every time I reboot the IPv4 settings go back to 127.0.0.1 and I have to put the NextDNS servers back manually and I can get to the internet. As of right now, NextDNS is uninstalled and the services set to manual and stopped. 

Could someone please explain what is going on? I would love to use the service. As a cybersecurity professional I think it's a good service, but if I have to reset the DNS every time I reboot I'll just get rid of it.