The name servers belong to more than one DNS provider.

NS_PROVIDER_MULTIPLE · Severity: Info

InfoNS_PROVIDER_MULTIPLE
The name servers belong to more than one DNS provider.
The NS set points to name servers of several providers. That can be deliberate redundancy, with each provider serving the same zone, or a leftover from a move between providers, where the old one may still answer with old data. The name servers themselves are not asked.
Recommendation: If a move between providers is finished, remove the old provider's name servers at the registrar.

Reported by

Info NS_PROVIDER_UNKNOWN A name server matches none of the DNS providers on the list.
Info NS_IN_BAILIWICK A name server lies inside the zone it serves and needs glue records.
Warning NS_NOT_FOUND The name has no NS records.
Warning NS_SAME_NETWORK All name servers are in the same network.
Warning NS_SINGLE The zone has only one name server.
Info NS_SINGLE_TLD All name servers are under the same top-level domain.