Images not clickable – lightbox does not open

Hi,
I am testing the plugin with normal WP editor, I insert the shortcode
[gallery ids="100797,100796,100795,100794"]

see the gallery here
https://accademiainfinita.it/2/post/88-i-cerchi-del-grano-un-incredibile-messaggio-per-l-umanita/

but the images are not clickable, no lightbox.
I also tried adding link=”file” but that only open the original image with no lightbox.

Before I deactivate all my plugins (I do not have many TBH) and debug, is there anything I should check in particular for an issue like this?

Thanks!