Hi there, @Shannon.
I'll share some information on how the Account Receivable Aging Summary report works.
The past-due amounts shown on the report depend on the Aging Method selected. It's possible that the Aging method on your A/R Aging Summary report was set to Report date that's why there are past due amounts shown for certain customers.
Since you want to view the current data, you can toggle the Aging method to the Current method. I'll attach a screenshot below for your visual reference.
You may want to check out this article to learn more about the Account Receivable Aging Summary report: Run an accounts receivable aging report.
Just in case you're seeing customers with net zero balances in the A/R Aging Summary report, it's usually caused by an invoice that's not linked to a payment or credit. To clear this up, you can read this article: Clear up customers with zero net balances in the Accounts Receivable Aging report.
Fill me in if you have follow-up questions about this. The Community team and I are always here to help!