lightbox partially working

In my webpage, I have four galleries. The first and last work: when clicked on any thumbnail, it pop up the lightbox to show the details.
The second and third are partially working. For example, in the “Scenes, Sites, Stories” gallery, clicking on the first few thumbnails has no response. It does pop up when clicking on the last few thumbnails.
Please let me know what is wrong with this. Thank you!

The page I need help with: [log in to see the link]