onClick Broken

I use EasyPro Gallery on other sites. At http://karnestx.com/photos/, I have it set up exactly as I do on another site where the plugin is working. The only difference would be that I used the Twenty Fifteen template to make this site. I have turned off all other plugins and the gallery hasn’t worked. Changed the theme to default, but still no luck. The wp_head function is in place.

Why does it not work here, yet it does with the exact same code on another site?

Thanks

https://wordpress.org/plugins/wp-easy-gallery/