Dear Ismael,

Thanks I see your changes, correct. They are there, they also look fine for me, no error.
BUT my concern is: a few sentences to add was working for me too. The automatic disappearence happens when more content is added and the new content is higher than a standard screen. You can youself experince this, just add a litlle bit more content please: add please a few more header with laurem ipsum, and longer copy in the same fields -> I belive after more content you will experince that everything you added will disappear automatically. Publish, step out, check the page, and it wont be there anymore. When you step back to editor it will be disappearing also from there. Pls try and let me know.

Thanks!
Szilvia