Why does the source citation from Ancestry read "1915"?

Source Citation: New York State Archives, Albany, New York, State Population Census Schedules, 1915; Census Place: Election District 02, Assembly District 07, Lancaster, Erie, 4.

Source Information:
Ancestry.com. New York, State Census, 1925 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2012.
Original data: State population census schedules, 1925. Albany, New York: New York State Archives.

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