Incorrect error message in admin

In admin I see the error message:

The nameservers set on this domain are incorrect. They are currently [Not Set]. Use your domain name registrar's
			control panel to set the nameservers to;```

However this is not true. It is set:

$ nslookup -type=ns

Non-authoritative answer:  nameserver =  nameserver =

Authoritative answers can be found from:

What’s going on?