I happened to me too many times. I edit a post, usually questions, I add the description of the changes, and then I press to Save to suggest the edit, but it acts the same as I pressed to cancel. Nothing happens and the web shows the post again, without the:
"Thanks for your edit, wait until is peer reviewed"
Losing all the changes and forcing me to do all the work again. Is this something that is happening to somebody else? Maybe because of using Chrome?