Sometimes you can see wrong information regarding WHM/cPanel nameserver info. You can see it from Main >> DNS Functions >> Nameserver IPs . To fix this issue you need to edit two files /etc/nameserverips and /var/cpanel/nameserverips.yaml
1) Edit the file /etc/nameserverips .See an example below,
# cat /etc/nameserverips 192.168.1.100=ns1.yourdomain.com 192.168.1.101=ns2.yourdomain.com
2) Edit the file /var/cpanel/nameserverips.yaml , See an example below,
root@it [~]# cat /var/cpanel/nameserverips.yaml --- ns1.yourdomain.com: "192.168.1.100": 1 count: '1' zones: yourdomain.com ns2.yourdomain.com: "192.168.1.101": 1 count: '1' zones: yourdomain.com