Isn’t working for logged in users

Hi,
Plugin, theme (Flatsome) and WordPress updated.
Excluded wishlist pages from cache.
Visitors are able to add products to wishlist and see them on the list.
Users with account and logged in try to add products to whishlist, get a message that it’s added but no product is stored in the wishlist.
If I try as a visitor add a product to the wishlist I’m able to do it. When I log in the wishlist it turns empty.