In Edit mode the images are not showing up

Using Drupal 7.63
CKEditor

Everything works fine when I create a new Basic document, upload an image and the image shows up in the body.

However, after I save it and then Edit the same document, the text is there but the images don’t show, even though the HTML <img code is still there and the image shows online.

I have rebuilt permissions
All permissions are correct
Made sure the Full HTML text format is correctly configured (default)

What else can I check?!

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed