Galleries doesn’t load at first click

Hi
I have a strange problem with the galleries I made for a portfolio page:

https://www.occhioiperteso.it/portfolio/

If you click one of the 3 imgages the page open but galleries continue to load
if you refresh the page sometimes they load immediately

it’s a strange behavior because sometimes they load at first click too….

already cleared all the cache on the plugin and browesers but no results at the moment