SUCCESS All your nameservers agree that your SOA serial number is 2019030706 That means that all your nameservers are using the same data.
SUCCESS SOA (Start of Authority) record states that your master (primary) name server is: ns1.hostens.com That server is listed at the parent servers, which is correct.
SUCCESS SOA serial number is: 2019030706 This appears to be in the recommended format of YYYYMMDDnn, where 'nn' is the revision. This number must be incremented every time you make a DNS change.