Why does the script count the number of products through one?

Question

JavaScript

Good day!

There is an online store magazin.molecularmeal.ru/
On any product page, for example magazin.molecularmeal.ru/nabor-tekstur-po-molekuljarnoj-kuhne, if you click on the "plus" in the quantity of the product, then the quantity is added after one, just the same and diminishes.

The same thing happens if you enter the quantity manually and try to increase or decrease.

In the script file (/catalog/view/javascript/common.js) the addition looks like this:

$(".quantity-adder .add-action").click(function(){
  if($(this).hasClass('add-up')){
    $("[name=quantity]",'.quantity-adder').val(parseInt($("[name=quantity]",'.quantity-adder').val())+1);
  } else {
    if(parseInt($("[name=quantity]",'.quantity-adder').val())>1){
      $("input",'.quantity-adder').val(parseInt($("[name=quantity]",'.quantity-adder').val())-1);
    }
  }
});

How to be? Where do I need to fix it so that the quantity of goods is considered normal?

Answer 1

You have 2 scripts
catalog/view/javascript/common.js and catalog/view/theme/megashop/javascript/common.js connected there
And both have code for +\- , obviously, and it works 2 times.