In the P996 property of

https://www.wikidata.org/wiki/Q81629203
the reported image pixel sizes (783,33333333333 × 1016,6666666667) disagree with values reported in the Commons file page (784 × 1018):
https://commons.wikimedia.org/wiki/File:PL_Doyle_-_Dolina_trwogi.pdf

They are probably taken from an older file version.

Note, that the top file version was uploaded months before the Wikidata item was created and the property added.

The numbers being non-integer makes the discrepancy more evident in this case.