IPv4 binding to nordlynx interface instead of eth0 interface, also DHCP assignment issues

I have a Raspberry Pi that I use as a media server, but I've decided that I'd like to put Pi-Hole on it as well.

1. IPv4 keeps binding to the nordlynx interface even though I explicitly tell it to only bind to the eth0 interface during install. After the install, I go into the DNS settings and tell it to only listen on the eth0 interface. I point my router's DNS to the eth0 interface on the pi (static address), but none of my traffic appears to be going through it.

2. I'm enabling the DHCP server on the Pi-Hole with the proper start, end, netmask, and gateway addresses, but every time I disable DHCP on my router, automatic IP address assignment doesn't pick back up even after I forget the network, restart all devices, and reconnect. I still end up having to set a static IP address to be able to connect to and manage my router and devices. Even then I still can't access the web.

I'm a networking newb and any help would be greatly appreciated!