The page hide the gallery

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Hello,
i'm using a shortcode to display a gallery, but the theme hide the page before to load which break my grid layouts. So, how can i fix this? I've tried adding some JS code like this into the plugin but it seems it doesn't work:
$( window ).load(function() {
$(window).trigger('resize');
});
Thanks a lot!

Here is the link: https://www.openartweek.com/artisti

Dear @francesco_migl
have a look here:
http://laytheme.com/documentation.html#custom-javascript
What exactly does your jQuery do?

Best!

Marius