Gallery Disappearing in Collage Mode

I’m working on creating my website and I’m trying to create a gallery. When I choose to display the gallery as a collage and publish the page, the gallery disappears. When I go back to edit the page, the Gallery box is still there and editable and will show back up if I choose to display the images as Thumbnails, but they just refuse to display as a Collage. I’ll display them as Thumbs if I really have to, but I’d rather have them display as a Collage. How can I get them to stop disappearing? I’ve left the page in Collage mode for now for you guys to see.

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