Add to Cart button and Cart not working

[rednerium]

Hello all,

I have a problem with my eshop in the standard version of PrestaShop that I am using. My website is http://eshop.rednerium.com/en/ and the "add to cart button" is not working directly when you click. In fact, when you click the product has already added to the cart but customer cannot see it unless he make a refresh or click somewhere else (when you are in the product the button keep loading non stop). Same problem exist in the cart (top right) when someone trys to remove a product. Is there any solution on it? Can somebody advise please?

Thank you