Hey Carl!
Thanks for reaching out to us here – unfortunately, this question might best be suited for the WooCommerce Order Barcodes creators themselves. Our “tickets” exist as WooCommerce “Products”, so as long as barcodes are supposed to be generated for each and every product in someone’s cart, I assume that things should work okay.
Let us know if you can contact their support for help on this issue – and if you have any other questions, too!
Thank you,
George