Hmm. That really is quite curious. It's working fine for me, and I'm not sure it's something that I can really edit/modify. Have you tried viewing the images in a different web browser or different computer?
Otherwise, when you get a chance, please check out the Icemule maps. I went ahead and updated the links at the bottom of the first three images to point to the image file directly. If this is a good workaround for you, I can go update all the rest of the image links.