The ticket item "STP: Aina - Joy" is not shown in greyed out status even after the item has already been used. I expect it to be shown like the "737: Bow" ticket item also shown in the screen shot below.
If I try to use it, the system shows the following dialog as if it is a valid item to use.
But actually the game returns an error message as "STP: Aina - Joy is either already been used or cannot be used.".
Honestly I don't know if this is a bug or an expected behavior. But this behavior is quite different from other ticket items and very confusing. I hope it will be handled in the same way as other ticket items.
As additional info, I haven't checked out about other stamp ticket items. This Aina stamp is the only one I got multiple instances of the same item.