You mix up the ns field with the ns records of the domain. The nameservers of a domain have to be added as ns records. Create a domain with the wizard and take a look at the records that were added for this domain to see a full example.
The DNS wizrad has no known bugs, I just tested it. If you created your own template and this does not work then there is most likely a typo in your template syntax. try to use the default template delivered with ispconfig.