Hi Raylen,
It is my understanding that Ancestry does not actually have Records of the Vic BDM, but used publicly available sources when they prepared their own database "About Australia, Birth Index, 1788-1922"
"Ancestry.com. Australia, Birth Index, 1788-1922 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2010.
Original data: Compiled from publicly available sources."
and
"These records are indexes; they do not include images of actual birth records. They can be searched by: name, birth year, birthplace, father’s name, mother’s name."
I do know that when NSW BDM's online index was recently upgraded that some of the then existing flaws were overcome, and like many indexes, other flaws developed. Perhaps similar happened to Vic BDM when their most recent upgrade occurred.
Have you considered contacting Vic BDM direct and asking for their comment?
JM