Lightbox has remnant images in gallery from previous template

I am repurposing a previous website. I can swap out the 10 images on the home page for 10 new pics. I can add those same 10 new pics under the Element tab. But, when I open the gallery, the original 10 pics are there, along with my 10 new ones. So, 20 total. Banging my head against the wall trying to figure it out how to ding the original 10 pics. Any help would sure be appreciated.

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