Add to Cart and Refresh Issue
You can add the following code in functions.php file
add_action('add_to_cart_redirect', 'resolve_dupes_add_to_cart_redirect');
function resolve_dupes_add_to_cart_redirect($url = false) {
if(!empty($url)) { return $url; }
return get_bloginfo('wpurl').add_query_arg(array(), remove_query_arg('add-to-cart'));
}