Dear team, working my way through the theme. I really love

Dear team,
working my way through the theme. I really love it!! But, the deeper I go, the more questions of course. This one: I made a lightbox, "clicking outside will close the box" and "Show Close Icon" are active, but when I test this on the site (Mac and iPad), I can't see the icon, nor can I close the lightbox by clicking outside the area. In fact, I can only close the lightbox by shutting down the page.... A bug? Or a setting mistake? I like to have your opinion on this!
Kind regards,
Josh Haijer