Image errors some sites

I have a bunch of WP sites and most use the same scripts

One of the scripts is XYZscripts HTML Snippets

So I have a stock HTML snippet that pretty much all the sites use, pulling 10 images from the same site with links to the same things, in other words it’s my own custom ad snippet, I show something I stock and link to the pages.

So far the site hosting the images, is not able to display the images, they are all broken links.

Yet other sites with the html snippet to that sites images show fine.

So what do I have to do to get my site with the images to show the HTML properly?

When I deactivate W3 on the site with the images, the code works fine, so something in W3 is choking on HTML snippets with images to it’s own site.