Images not showing in half the post

I recently changed my WordPress from root to a it’s own directory (followed this instructions). Everything worked fine and the site is working, but the images are a total mess. Some blog post (example) shows the header images but others (example) don’t. Also the media library shows half the images broken and the other half working correctly. I honestly have no idea what’s happening and I haven’t find a solution.

I will really appreciate any help. Regards