Modula lightbox navigation doesn`t work

Hi everyone,
i have a problem with the Lightbox. Somehow the navigation doesn`t work on this side: https://www.jeromehoffmeister.de/

Do u know any solution for me? Btw..i used the nimbler page builder for creating the side, maybe here is the problem. I have already created a test page without nimbler and there everything seems to work properly.

All the best

Jerome

The page I need help with: [log in to see the link]