Hi Again,
Thanks for using WooCommerce Tickets. I can help out here.
I visited your site and see the coupon. We do not have any features to display or hide a coupon and WooCommerce runs the coupon system, which we do not modify.
If you only want the coupon to provide a discount for a specific ticket you should set the coupon to do a product discount and choose that ticket product. That way it only works on it and not the other ticket.
Let me know if you have any follow up questions.
Thanks