Nameserver record keeps getting added to DNS zone in Windows Server DNS

I have a public DNS server running on a Windows server with the hostname dc01.

A nameserver for this hostname (dc01) keeps getting added to the DNS zone:

If I try to delete it, then reload the zone and refresh; the record is immediately recreated.

Running a DNS check for my domain name on MX Toolbox shows an RFC 1035 violation for Primary Name Server Not Listed At Parent in that Windows DNS Server is publishing 3 records, but only 2 records are listed at the parent DNS server (ns1 and ns2).

I could fix this by adding dc01 as a nameserver record in my parent DNS server (domain registrar), but I don't actually want 3 nameservers - I just want the 2.

How can I prevent Windows DNS Server from creating the dc01 NS-record?

_{As an aside, I know that the 2 nameservers should be on separate IP's.}

^{Also, the following changes have been made to DC01 and the DNS Server service was subsequently restarted:}

^{DNS > Zone > General > Dynamic Updates = None}

^{NIC > Properties > Advanced > DNS > Register this connection's addresses in DNS = Unchecked (disabled)}

^{HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters\RegisterDnsARecords = 0}

^{HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DNS\Parameters\PublishAddresses = 116.202.233.75}

^{These changes prevent the internal 192.x.x.x IP address for DC01 from being published publicly to the world in the zone as an A-record. Instead the external public IP is published to the dc01 A-record.}