Can we just ask for a bit more information on what is happening.Is it the invoice numbers that are duplicating or the content of the invoice itself(amount rate description etc. Also can we check do you use recurring templates at all?
Thanks for joining on this thread, @Jolene Rupp.
QuickBooks Online helps you stay organized with your records. To keep the message from showing up, let’s turn on the Custom transaction numbers feature.
Next, create an invoice and enter your desired number. Whenever you create a new transaction, the invoice number increments by one.
For additional information, see the How to change the invoice number on sales forms article. It contains a video for visual reference as well as instructions on how to set your own numbering preference.
Let me know if you have any other concerns. Please know I’m here to help and make sure you’re taken care of.