I sent an invoice to a customer and the banking details on the invoice were different from mine. how can this happen?

Hello there,

In QuickBooks Online, when an invoice is configured with different banking details than your usual ones, it could be due to a few reasons. First, you may have accidentally input different banking details while creating that specific invoice. Double-check to ensure there were no data entry errors when creating the invoice. 

Or since QuickBooks allows you to customize invoice templates. It's possible that a different template was selected or customized for that particular invoice, which contained other banking details. Also, it's possible that the banking details are edited after initially sending the invoice, and the reminder reflects the updated information. Check the invoice template settings to make sure they match your standard template. Then, try resending the invoice.

You can visit this article you can use in the future: Customise invoices, quotes, and sales receipts in QuickBooks Online. It also includes details about editing custom templates.

Feel free to post here again if you have further QuickBooks-related concerns. We are available 24/7 to lend a hand with each of your queries. Stay safe!