Has anyone ever seen summary data be different from detail data in the Sales by Item Report? I have a SKU that shows 67 items sold this year on the summary, but when I click into the details I count 70 (73 sold and 3 returned). Revenue amount on both summary and detail are equal. I also checked dates on both to confirm my ranges were the same

Unit of Measure thing maybe?

Duplicate the same thing in a saved search. I've seen that report specifically throw incorrect values (specifically due to inactive items).