We just checked your website and see that adding to cart function works correctly and the page is not reloading. Could you please provide us steps how we can reproduce it on your website?
On page http://104.131.169.57/ if I add a product to the cart through the Quick Shop it loads and throws the page to the top. In example https://demo.xtemos.com/basel/shop/?shophover8 if I add a product to the cart through the Quick Shop it does not throw the page to the top and highlights shows almost half the screen on the cart. Do you understand?
in the theme template even when I click the buy button there is an animation that keeps turning on the button itself. I do not know if I have something disabled that does not appear in my has.