Cart not clearing AWO Gift certificate

-- HikaShop version -- : 3.5
-- Joomla version -- : 3.8.8
-- PHP version -- : 7.0

Hi

My site is setup to use the new check out system.
Multi-cart is set to no, clear cart is set to "Created"

I am using AWO to issue gif certificates, the problem I am having is if someone checks out a product on our site and does not use a voucher to pay the system clears the cart as soon as the order is created, so it is working correctly.

If someone pays using a voucher thus discounting the amount to 100% the system immediately confirms the order it, however, does not clear the cart.
I have tried setting the Clean cart when order is to "created" and to "confirmed" nether seem to work, is there some other way I can set it up using mass action or any other means to ensure that carts are cleared.

My feeling is that there are too many processes happening simultaneously when the user clicks finish the system starts enrolling them into our e-learning system. My feeling is that this causes Hikashop to not clear the cart.
Will it be possible to delay the clear cart function by 10 - 40 sec

Hi

I have checked, but under customers/carts there is only one cart per customer.
Once I process the order and make payment with the voucher the order is confirmed but if I login to my demo customer the exact same items are still in the cart, if I look under customers/carts the cart still has the exact same ID.

The "validate free order" plugin is definitely not clearing the cart.