My gift certificate remain in cart after purchased

Hi All
I recently finished configuring my cs-cart multivendor. I signed in as a customer to purchase a gift certificate and saw that the gift certificate remained in the cart after payment.
I try to remove it, but it is not possible. Please assist me if you know how to handle this or have dealt with a similar problem.

I have click all of the button to remove my cart but it cannot as the photo below

thank you in advance