It’s very hard for us to say as we don’t know what’s in the page you’re showing.
If you look in the Player library on the PC, you’ll find files with a .html extension. One of those will be the webpage widget for your layout.
You can open that in Internet Explorer (not Edge) and see how the page looks. My guess is the webpage image links are served by something that prevents use in iframes, but without knowing what you’re showing I really can’t say.