I am using the CLASS field to categorize transactions in Quickbooks Desktop 2021.  When I generate a Transaction Detail report, filtering (and sorting) by class, almost half of the report shows empty (blank) class fields (they are not class specific - it's any class).  They are categorized at the end as Unclassified.  If I then look at each individual record that shows a blank class field, I verify that the field is NOT blank.  Can anyone explain why this is happening?  I'm completely stumped.