Sometimes, when we create an invoice, the system creates a duplicate invoice automatically.

If you see a duplicate invoice after creating one, it's typically caused by either an overlapping scheduled recurring transaction or a third-party integration that is set to react to new invoices. To resolve this, review and edit your recurring invoice templates to prevent overlap, and check the sync settings of any connected third-party apps to ensure they aren't duplicating QuickBooks Online invoices.

You can also use the audit log to view every create or modify event, including timestamps and the user or system that triggered them. This makes it easy to determine whether invoice #1395 was created by the same action as #1394 or by a different source.

If anything else comes up, feel free to reply to this thread.