DNS-problem - authoritative Nameserver refused, not defined or timeout

Hi

My question is that 2 or 3 weeks back with the same configuration I got A the result of the test, and now I got X.
I did not changed anything from the last time I ran this check. Last time with both nameservers pointing to the the same IP address I got an A.
Is this something that changed recently?
I have only one machine and I host my DNS on that machine, so I do not have two IP addresses. What should I do?

Thank you.