The wishlist is empty after that the customer add products in list

Do you have Wp Engine as host?

The problem is the cache of WP Engine. You can contact the support and ask to add a cache exception the wishlist page.

Hi!

My site runs the YITH Woocommerce Wishlist plugin and we are having some issues with page caching. The Yithemes team has instructed us to ask you to place a cache exception on our wishlist page.

Could you please add the following URL to the exception list?

• [ add the url of the page wishlist ]
• [ add the url of the page wishlist ]/* (for all wishlist page endpoints)

Besides, YITH WooCommerce Wishlist plugin uses cookies in order to correctly store user's wishlists; can you please add yith_wcwl_session_* cookies to your exceptions?

Thanks!