I've noticed an error with invoice numbers that has existed for about a year now.
If you enter an invoice as a recurring transaction and then don't close the sales window, and start a new invoice that is not recurring the invoice number will be whatever the auto number was when you first opened the window. Additionally, it won't have the repeating invoice number error pop up.
The only way to generate a correct invoice number is to close the window and re-open it. This does not occur if you enter non-recurring transactions in a row or when entering recurring transactions in a row, it only occurs when you try to enter a non-recurring transaction directly after entering a recurring transaction.
I don't have the recurring transactions set up on browser so I have not tested to see if the bug occurs there.
AccountRight Standard 2026.4.1.6