If I use DNSCMD and /zoneexport I get the one record as show below, with four values. Only one of them is dynamic (the one marked [AGE:]). The dynamic record is the only good one:
[AGE:3579987] 900 PTR test2.test.com.
900 PTR test3.
900 PTR test4.
In ADSIEDIT.MSC, it stores the records similar to what you see in the zone export, where there is one record for DC=51.20 in DC=10.10.in-addr.arpa, where the 4 records are the values for the dnsRecord attribute:
The octal data stored in the dnsRecord attribute is the “name” you see on the DNS PTR “record”, but it is stored as a multi-valued attribute. The creation date is the date the *first* record was stored/created. So it depends on if the dynamic was first, or one of the manual records was first.