What a DNS lookup shows you
A DNS record lookup asks the domain name system what a name currently resolves to. It is how you confirm that a site points at the right address, that mail is routed to the intended servers, and that verification strings a provider asked you to publish are actually visible.
Why two lookups can disagree
Each resolver keeps its own cached copy of an answer until that record's TTL elapses, so two resolvers can return different results for the same name at the same moment. If a record you just edited is missing, the cached previous answer and its TTL are usually the explanation — wait out the TTL before assuming the change failed.
An empty type is not an error
Most domains publish only a few record types. A CAA or AAAA lookup returning nothing simply means the domain does not publish that type — distinct from a lookup that fails because the domain does not resolve at all. If nothing resolves, check the registration itself with WHOIS / RDAP, or confirm the name is even registered with the domain checker.
DomainsMesh is an independent tool. DNS results reflect the records returned for a domain at the time of the lookup and may be cached by intermediate resolvers.