Thank you for using Auto ThickBox Plus.
I checked your site. The URL of large thumbnail is the same as 8th photo in "Photo Gallery". So ThickBox shows the former image instead of the latter one. This is thickbox.js bug, so I will fix it in next release.
Until then, please use one of the following workaround.
? sign to link URL of first image like below
In the result, the two URLs will be different but links are works since
? sign is ignored.
rel attribute to
<a> tag of first image like below
<a href="***-lambs.jpg" rel="gallery-any">
In the result, there will be two galleries. So the images with same URL will be included in a separate gallery.
rel attribute value is arbitrary.