Site reverting back (like i never did any editing)

Hi,

After this happening twice I understood that it's not a chase or double window (where one overwrites the other) issue.

I've been working on a site, using themify builder and then it goes back to the point it was a hour or two ago, before i started working on it.

I host with wpengine and use themify, work on chrome (macbook pro).

Any ideas?

thanks,
Tomer