Thanks a lot for sharing this with me.
It looks like it is a tool problem at Web-oke.nl DNS Zone Editor. Could you please try contacting them
so they can check this further?
Please, kindly ask them to add the following records;
Name: @
Type: NS
Value: ns1.dns-parking.com
TTL: 14400
Name: @
Type: NS
Value: ns2.dns-parking.com
TTL: 14400
As soon as the records are correctly added, let me know. 🙏