Hi there,
Thanks for writing in! I can see some images are opening on lightbox and others are not. So I guess there is something wrong on your setup. Kindly follow the documentation from here – https://community.theme.co/kb/integrated-plugins-envira-gallery/
Also can you confirm that you are fully updated? (Theme and Plugins)
You can find the latest version numbers here: (http://theme.co/changelog/) Then you can compare them to what’s installed on your site.
If you find anything to be out of date, you can review our update guide.
Cheers!