Thumbnails Won’t Load

So frustrating. The thumbnails for the podcasts episodes won’t load. I’ve uploaded them to each individual page and set it as the featured image (each page will have a different image) and only episode 22’s thumbnails show. But when you click onto the episode you’ll see the image- except for episode 22- it’s the opposite- its thumbnail shows on the home page, but then doesn’t show on the episode page. I’m stuck. Frustrated.

The page I need help with: [log in to see the link]