Worksheet function Vlookup and VLOOKUP return different results

No problem

This might be a little more versatile.
It allows Range A5:A7 to grow dynamically

Function ReviewDate(start_date As Range) As Date
    Dim varReviewDate As Range
    Dim LastRow As Long
    
    LastRow = Sheets("ReviewTable").Range("A" & Rows.Count).End(xlUp).Row
    Set varReviewDate = Sheets("ReviewTable").Range("$A$5:$A$" & LastRow)
    ReviewDate = WorksheetFunction.VLookup(start_date, varReviewDate, 1, True)
End Function

Hope this helps