this is for Quickbooks Desktop Pro 2020 on Windows 10

When I run a report a report for either a bank account or a credit card to display all transactions AND I customize it to ADD the Class field / column, the report works as expected EXCEPT almost every row show the Class field as blank or empty (when they do indeed have a value).

I really need this function to work as expected? 

What is the solution and why is the report displaying incorrectly?

Many thanks in advance.