Problem with wp_query in Safari

The Query for my custom post type works well for most browsers, but there’s a problem loading the images in Safari for MAC (not iphone), the may appear at first sight but they dissapear constantly

https://theplacetofrip.com/ville/friperies-montpellier

I have modified the Query several times to reduce the quantity of elements charging (the problem seems to be worse when there are more custom post types being shown).