Images, inserted in my post are only visible to myself

Few hours ago, I've started a new thread. I've added 3 images in the text of my post, using "Photos" button in the default "rich text" editor.

Now (e.g. few hours after posting that), after refreshing a page, I only see placeholders instead of the my images. (Because this new forum logs you out and there's no "remember me" checkbox). But... After logging in I do see them again.

 When logged inNot logged in or other user

This clearly looks like a bug. Or... Am I doing something wrong?

Do you see images in this post? Do you see images in that post?