If I create a new option type checkboxes or select box, it is always shown in duplicate on the products page.
but only one was created.
I’ll contacted with the plugin support and seems
the problem is in the Xstore theme:
> The problem is your theme. In the file
> /themes/xstore/woocommerce/single-product/add-to-cart/simple.php it
> uses the action woocommerce_before_add_to_cart_button two times which
> is wrong. I can fix the template but you should contact the developer
> to fix this so that you won’t have the same issue with future
> releases of the theme.