Hi Peter, thanks for getting in touch!
That’s certainly strange. Are all the orders for those tickets marked as Completed in WooCommerce? Attendees will only display in the list below the yellow box if an order has been marked as completed in WooCommerce.
For example, here is a screenshot of an attendee list where I have sold two tickets, but only one order has been competed. As such, only one attendee is in the list.
Check that all the orders have been completed in WooCommerce and let me know if no attendees continue to display in the list.
Thanks!
Geoff