Joomlart Demo

This is just to illustrate the problem. If you load this page on the front end, you can see that there is a complete gallery with images. However, if I need to perform any type of edit, as soon as I open the gallery in the content manager, everything in the "images and links" and "gallery" tabs disappears. I have to redo them every time. Should you open the file to edit it, and wish to replace the images to experiment, they are under /images/joomlart