Those videos are hosted on thumbsnap and are still not properly loading. When trying to view such videos on new tab using browser feature to view such video the is redirected to actual video page but the browser shows error like the video was corrupt or in unsupported format. Checking browser console shows 404 page on final url. It appears there's still something wrong or messed up on thumbsnap causing videos not showing properly, like not finished processing, not moved to right place or other unknown problem, etc.