The issue has to do with the field being searched in PubMed when using the Entered Between function.
It is searching a field called EDAT
So when I look up the reference
First molecular identification of the vertebrate hosts of Culicoides imicola in
Europe and a review of its blood-feeding patterns worldwide: implications for the
transmission of bluetongue disease and African horse sickness.
The EDAT is not Dec but 2017/07/28
So the only way to find the reference would be to a search that includes Entered Between
2017/7:2018/01
The field searched is not the Date field that shows DEC.