I have checked my site using the emulator you provided. This is for a mobile device. That said, the images are still not rendering correctly there or in desktop browsers. We are very intentional with these graphics and they should all have a ratio of 16X9 in their resolution. The images are all stored as 1920X1080 jpeg images and should maintain the 16X9 ration when resized and used as thumbnails.
You can see what I see in these screenshots: