Hello, Sahil
We’ve updated the theme on your site.
Please do not update Core plugin before the theme update next time.
About ajax add to cart, there is an error in the browser console https://gyazo.com/ecc6a478c7bf44a4f1ac6bda69e85fe6 , after disabling the Pixel Manager for WooCommerce plugin the ajax add to cart works fine.
Product thumbnail is not visible, slider is not working in product images and in related products.
– we do not see this problem on your site right now.
Kind Regards,
8theme team