Hi Nmedia
I have a similar issue. My “add to basket” button does not update the cart items in the header. Only on page refresh or when I open the basket I see the items added, and the cart in the header refreshed. I have tried with and without the “Enable AJAX add to basket buttons on archives” option.
I am using Divi + Divi Product Carousel plugins.
Really Simple SSL, Wordfence, Askimet and WP Server Stats are the others.
Any ideas?