SSH to server
cd /etc
cp /etc/nameserverips /etc/nameserverips-ori1
nano /etc/nameserverips
remove the old name server
Save the file and restart named
service named restart
If it still no remove, login to WHM
Go to Tweak Settings under Server Configuration
enabling Allow Sharing Nameserver Ips & Disable whois lookups for the nameserver ip manager
done