Feature image not setting from library

Hi guys, we were testing Jetpack on our website and we realized that since we installed it, none of our author have been capable of setting any feature image in the post editor or in anywhere at all.

We write the posts as usual, but when we go to Feature Image, and since Jetpack offers so many options we thought it would be cool, but the moment we try to use any of the options, and we select any image at all, simply the button to set that image as feature image won’t work.

We’ve tried on different posts, we’ve re-installed wordpress, and went back and forth with our theme (Newspaper by Tagdiv), but we are sure this issue was due to jetpack, although when we deactivate it and even remove it from our site, the issue persists…

I can provide credentials if anyone from the support wants to check in and figure it.