Why i can use one gift voucher more than one

Hi everybody,

I am expecting that i can use gift voucher just once, but i can use more than one.
How to set that i can use gift voucher just once?

Thanks

I think this is because of the order statuses.

Check in settings of the shop, which order statuses does reduce the quantity.

You may have Processing - as the status locking vouchers,

but multiply orders you do with the voucher and lets say "cash on delivery" - go to status "pending" , and for the cart those orders are not accepted yet