Ok Rashida,
The goal is that we both must understand te same thing to solve the problem. Watch the document attached in the hiddend content.
So, can you see in the administrator zone the pictures that I've published in this article.... including yours... (1)
...and the same article in the Frontend. The picture has disappeared !!!!? (2 & 3).
I absolutely want to know the cause of this problem because I can't deliver a website to my clients who wouldn't understand this bug.
I suggest that the problem comes from Helix, because it not exist when I publish pictures from de jooma editor.