The issue is that these "images" aren't just images. You have used code to add images that are wrapped up within advertising code that is designed to track users.
Anyone with a privacy tool (an "ad blocker") will not see the images at all because they will be considered "Amazon advertising" and will be blocked. Some browsers may have this built in.
The workaround is to replace these Code Blocks with standard images in Image Blocks. You will be able size these to meet your needs, and you can add your affiliate link to the Image Block so that when clicked/tapped, it sends users to Amazon.
I had this problem too and was losing my mind over it. The way I solved it was by turning off the AdBlock extension in my browser while I'm in the editor and now it's working beautifully. I hope it will work for you also.