Thumbnail issue with facebook

Hi,

Since a few days, I’m experiencing an annoying glitch when I try to post link on my fanpage site : I can only get a “thumbnail loading” image from WordPress. I can’t even get images from previous posts, when I didn’t have this bug.

But what is weird too, is that I can get images if I do post a link of the homepage of my website : https://www.silence-action.com/

Here’s a picture showing what I get when I try to post a link :
https://imageshack.us/f/222/wpbugjpg.jpg/

I’ve also tried to install the plugin “Easy Facebook Share Thumbnails” but It doesn’t help me with this issue…