For a photo gallery I am using jQuery Fancybox, but something strange is happening. When you land on that particular page you will see all photos from the gallery. On the right hand side is a menu with different categories. Like I said when you land on the page all photos will show and Fancybox is working perfectly, but when you click on one of the categories (e.a. Restaurant, Eten) Fancybox isn't working any longer, instead the photo opens in a new page. You can see what I mean here.

Does anyone know why this is happening?

Thank you in advance!