It’s great to see you in the Online Community, 2017ops1.
Editing the invoices can help correct the data sent to your customer.
All you have to do is open each transaction and update the information from there. The steps are as easy as 1,2,3.
If you mean that the second invoice has been duplicated, void the other one and then modify the details. You can simply follow the steps mentioned above.
For additional reference, I'm attaching a link with detailed instructions on how to find
transactions in QBO.
Your customer should see the updated information on the invoice.
Keep me posted with the outcome after following these steps. I’m always right here to assist further.