Ohw that last ipv6 nameserver address could be causing the nslookup parse failures.
I believe the "enp2s0" bit is when using Predictable Network Interface Names which you are not using as the interface is still named eth0.
I dont know how you've configured network for this client computer but its save to temporarily remove that last line in /etc/resolv.conf and try do the nslookup's or host commands again.
EDIT: do mind, at next reboot, these changes will be reset in resolv.conf depending on how network is configured for this client.