Well perhaps I should include a screenshot because when I view the link I included the screen image is clearly going over the thumbs. Your screenshot is not the same as how it appears in my browser.
And did you try to refresh the browser? Sometimes there is a PNG layer (with the thumb) missing but after refresh everything should be fine :)
I see it too. There's another one a few images previous with a similar issue. (titled "Woman holding Nokia Lumina")