enfold – avia layout disappear after saving page

hallo,
We had a web site with many problems so we decided to change theme. we choose Enfold becouse we already built 10 websites with this simple and complete theme.
we imported the old web site in a new space to be able to create the new one. For weeks everything was easy and it worked very well. during this last week we had many problems: we try to modify an existing page, we use avia layout to create texts, mansory, ecc… and when we save the page eveything disappear. we can go back to the saved version and take them but when we try to change a text the style broke and it doesn’t work well. it is quite difficult to explain. We think about some code from the old web site who conflicts with theme but also a new page have the same problem. See private information. the page is …/nuovo-articolo-di-prova/ ‎and you can see differents saved versions but nobody of us delated anything. Theme “made”it…
I tried to delete or deactivate plugins, clear cache, but I can read website’s code.
have you some ideas?
thank you
Silvia