load whole site in the checkout step.

Hi,

I'm not able to reproduce the problem.
There is no coupon to delete.
And when I delete the product from the cart it works fine. And if I add it back with your link and then delete it again, it still works.
And I wasn't able to add several products to the cart as they were from different vendors.
Please provide more precise step by step instructions to reproduce the issue.

Hi,

The problem is not whether it is clear in the video or not. The problem is that I need to analyse the HTML, the Javascript being executed, and the AJAX requests between the browser and the server to better understand what is going on behind the scene. And for that, I need to be able to reproduce the issue as on the video, which I was not able to until your last message with the extra instructions.

From what I can see the issue comes from your customization of the cart module display.
When the coupon is being added/removed, it also updates the cart view and the cart module.
To refresh the cart module area, the system calls the URL daneh.ir/hikashop-menu-for-user-control-...-cart/tmpl-component
You can see this URL returns the HTML of the cart module:
i.imgur.com/HAlfHAn.png
But on this screenshot, you can see it also returns a div with the id "copon-section" and in that area, it has javascript from the checkout. However, that javascript messes with the javascript of the checkout already on the page which makes every action on the checkout not working properly on the page after that.
This id "copon-section" doesn't exist in HikaShop. Esepcially since it should be "coupon-section" not "copon-section".
So basically, the problem is something linked to the customization that was done for the cart module.