All the first ones were fine, it is only the last 3. I forget what causes it, but there's a reason you can see them all.
In my experience it's because of not using the image source link. Using the address bar link isn't the same address, and I have to right click the image to copy the correct one.
The non-loading images for some people is likely due to linking to images with http in the URL instead of https . That will cause image-load failures on some web browsers that are configured to not allow mixed-security-content sources.