Lightbox don't work

Hey, I bough the following Template:

kunena-templates.9themestore.com/#nts_kdrive

Unfortunately, the lightbox to increase the uploaded pictures dont work. What could be the reason for that? The Picture is shown in the left bottom corner...

My Joomla template is self made, but I think the lightbox settings for the kunena board are into the kunena template.

Hi,

Can you provide us the site url and a test account?

Thanks