SUCCESS All your nameservers agree that your SOA serial number is 1541060189 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: f1g1ns1.dnspod.net That server is listed at the parent servers, which is correct.
SUCCESS SOA serial number is: 1541060189 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.