No videos showing in lightbox when thumbnail is clicked

The page with the problem is https://www.mauriceproma.com/videos/

Thanks

This could be a problem/conflict with your theme’s css/js.
Try it on a different theme.
It could also be a conflict with another plugin.
If changing theme doesn’t work, you can try disabling some plugin that may have a chance to conflict with it (usually other gallery/slider plugin)