Some broken Galleries?

Many of my galleries do not work, although the photos should be there, only the name of the photo appears but the thumbnail is never seen.

Inside my website I can see apparently that all the photos are, although I cannot see the thumbnail if the name of each photo and the weight of the file appear

Throughout my website there are some galleries that do work and others that do not, I am desperate to fix this whole mess

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