Error loading the button.

Hi, I have a problem with the add-on.

When I have a product that can only be added 300 by 300 and I add to the cart 312. The system warns that you can not buy that amount and has to be 300 by 300.

But the buy button stays thinking with loading icon and the customer can not continue to add another quantity.

https://foodpacservice.com/tienda/ensaladera-oval-kraft-1000cc-170x120x75/