It just might be an old post where people have left and deleted their photos from a site such as Photobucket.
I made a mistake a few years back where Photobucket deleted thousands of my piccies and so all my posts had the pictures missing.
Luckily, I always store my photos on my computer and uploaded them again, but unfortunately, Photobucket puts them in a different location, so this site has the wrong address for them.
I did manage to get a lot of my posts modified with the new links, but it is very time consuming as it has to be done with every individual picture. Another thing is that after a certain time, old posts can't be edited to allow that to happen.
If ever you come across one of my posts with no photos (under Bogstandard or Blogwitch), if you contact me with a link to the post, I will only be too happy to send you the pics by email.
If you don't try it, you will never know if you can do it!!