SERVFAIL, but still returning correct data in answer

Probably a duplicate of Getting SERVFAIL for some subdomains of vmware.com - #4 by mvavrusa and Unable to resolve Nasa domains - #3 by _az , your domains have the same Secure to Insecure on the same nameserver setup.

If you want to work around it, you could try ensure that DNSSEC is secured all the way.

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