Hi there, White Female.
Thanks for joining this thread. I'm here to provide some additional information about Past due stamp on Invoice and guide you to the right support.
Technically, QuickBooks invoices will only post a past due stamp on the time these transactions are due. In your case, you'll need to review each transaction to see if they are old edited transactions that are due in the past. However, if the issue the same thing happens, you'll need to process the troubleshooting steps provided by my colleague ClayJ on his post.
If the issue still persists, I encourage you to contact our QuickBooks Desktop Support Team. They have additional tools to pull up your account and investigate this further.
Here's how to contact our phone support:
You may also check this article for additional reference: Show Past Due stamp on invoices.
Please let me know how it goes. If you have any other concerns about Invoice don't hesitate to leave a comment below. Have a good day ahead.