Okay, I have looked at the auctions. And then got to thinking. I am wondering if the image size isn't the key here. I have lots of images on some of my auctions and have not had any trouble with the images displaying like you and Sharon. But I resize all images and shrink by factor 2. I also changed the JPEG image quality settings and moved the setting closer to Lesser quality. That was just for browser loading.
What is so strange, none of my image tags look like yours or Sharon's. I don't have access to my company stuff but when I get back home, I am going to work and upload an auction or 2 just to see if the images do the "stretch" armstrong look.