Also, they should check their "Portal" / "Node Settings" on www.allstarlink.org and check that the "Is node a remote base station" value set to "No". If the node was set as a remote base then the DNS name would be #####.remotebase.nodes.allstarlink.org.
There is clearly a Linux problem. The second set of nameserver definitions should not be present. How do I fix it? I tried using nmcli but neither eth0 or ipv4.dns is recognised.
What does sudo resolvconf -l report on your system ?
Asking because one of my systems has the first 2 lines from "tun.wg0" (this particular node is configured to use 44Net) and the last lines are from "NetworkManager".
Nameservers of 1.1.1.1 and 1.0.0.1 is Cloudflare DNS. Unless the local network is blocking outbound DNS, that isn't a problem. It may not be want you want, but it shouldn't be broken.