Sidebar on blog shows a black square in the feature image

Hi 

My page at https://nicube.ca/wp/2017/02/03/devbrio-in-quebec/ 

Shows a sidebar on the right which has some feature images marked with a black square (With a zero) and others with just the feature image. 

I'd like the sidebar to only show the feature image with no black squares covering it. 

Thank you!

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