Adding multiple products to cart

Hi, yes, I just want to add more than one product at once to the cart.
Here you have a screen shot which may be helpful: https://imgbox.com/u9fg5u35

Doesn’t matter how many product I set in the input box (there is 6 on the screenshot) it will add always 1 product to the cart.

Here: https://canna.explayn.vot.pl/ (homepage)
You’ll have to view it in resolution under 767px. You’ll get popup which shows up when you click on any of the products.

Thank you for the quick response.
Unfortunately changing value of the input didn’t help. You can test it yourself by changing value manually in developer tools.
I changed it to 100 (along with url) and it still adds 1 item each time.

Could you point me into right direction? I mean what changes in the code will make it working?
I already know it’s not input value or url. So what condition triggers adding more than one item?

Thank you, it worked 🙂