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If one of two nameservers returns a response of "No such name" for a domain query, then the same domain query is not tried on the second nameserver.
When a response is already received from the first nameserver, the domain query is not attempted on the second nameserver. So even though an entry may be present on the second nameserver, the resolve fails. This is expected behavior. DNS operates on the assumption that all nameservers everywhere contain the correct and valid data. Always have two name servers in sync so they should have the same set of domain entries.
Two name servers configured: The DNS entry for a particular domain name is present only in one name server.
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