Essential Grid

I use the Essential grid shortcode on my page: https://alkeba.be/keuken/
The grid is based on my portfolio-pages. Each page has a featured image, and some pages have a few extra pictures in the content. So when i click on one of the pictures in the grid, a lightframe pops up. I can also go to the next image that is in that page, by clicking to arrows. So far, so good.
But the problem is: i can still go further by clicking the arrows, and see all the images on my webpage. So my gallery isn’t ending. I want the gallery to stop when the 1,2 of 3 images in my gallery-page are passed…

Someone who can help me with this?

Thank you a lot!