CMS Slider + Lightbox

I am at a loss. I have created a CMS Slider + Lightbox on my Products Template page using the Custom Image Gallery (Slider + Lightbox + CMS) by SketchzLab. Everything works great until I want to show thumbnails under the lightbox by clicking on the “Link with other lightboxes” checkbox and assigning it a group name. When I do this, everything still works, except it populates double the amount of thumbnails. So, for instance it shows images 1, 2, 3, 4 and then repeats this. So instead of 4 images it shows 8. The slider shows the correct amount of dots in the slider (4 in this example). Somewhere along the way, it is duplicating the JSON array for the lightbox-strip div, but not the dots for the slider. I also noticed that this is the same outcome when clicking on the “Link with other lightboxes” and assigning it a group name and exporting the original clone-able site, so it is not something that I have done but rather a flaw on the original site. I have contacted the developer several times but never heard back. I would use another method if possible, but I have looked and looked and can not find anything like out there like it (CMS Slider AND Lightbox).

Anyone have any idea on how to fix this? Here is a preview of the site: Zervas Site V-14

Here is my public share link: Webflow - Zervas Site V-14