Can you please help me fix Thumbnail image

Hey Guys,

I am working on this site and it is live.
http://xyz.nestaway.com/
For some reason this page's image appear to be broken(pixelates) http://xyz.nestaway.com/the-ease-of-settling-in-survey/

Other pages images appear to be fine
http://xyz.nestaway.com/category/reading-room/

It used to appear fine earlier, it appears to be broken now.
Can you please look into this?

Thanks