Thanks for the reply, @Ben621.

I'm here to provide more insight into Reports by Class in QuickBooks Desktop.

If you have partial payments for invoices showing under a specific class, then it won't reflect properly on these types of reports. This is because the payments are unclassified, while the invoice that's being paid may be classified. Only unclassified balances will be correct on this report after receiving partial payments. Invoices with classes on this report must be paid in full to show correctly in that specific class. You can refer to this Community article for more information about the workflow for classes that show on reports: Unclassifed transactions on reports.

If you have further questions or concerns about Classes or Reports in QuickBooks Desktop, please don't hesitate and reach back out! I'm always happy to help. Have a good one.