dedicated server - Cpanel nameserver error? Missing nameservers reported by your nameservers

I've got a new dedicated leaseweb server with WHM/Cpanel. There's only 1 IP.
I've registered the main domain iworldcreation.com at whois.com. It has two private nameservers assigned: ns1.iworldcreation.com and ns2.iworldcreation.com.

I also added two child name servers:
ns1.iworldcreation.com pointing to 95.211.9.24
ns2.iworldcreation.com also pointing to the same IP 95.211.9.24

I know two ns'es pointing to the same IP is nonsense, but still that's how I configured the domain @ whois.com.

On WHM I've setup BIND and added zones, but I still get errors like:
Missing nameservers reported by your nameservers when I check the nameserver setup via intodns.

Can someone advise where the problem is and what I need to do to fix it?