Lightbox images not matching up

Hi, I am unable to work out the logic behind the gallery and lightboxes on this page.

The images in the lightbox don’t line up with the gallery images, plus there are some rogue ones in there and I can’t work out where they are coming from.

If someone is able to take a look, that would be much appreciated!

Here is my site Read-Only: [LINK][1]
([how to share your site Read-Only link][2])