For the past year since WooCommerce 2.6 the shopping cart has been able to update it’s values automatically via AJAX when the user changes something in the shopping cart (quantities, coupon codes, etc).
But I just tested and my Theme X Renew does not do this.
How do I turn on this functionality?
See more details here about this WooCommerce feature: https://woocommerce.wordpress.com/2016/04/19/cart-ajax/