Thread:Reg Boy/@comment-26570260-20160111163251/@comment-24971252-20160111170540

It's a known "glitch", as far as I know. I've faced it quite a few times myself. Dunno what exactly causes this thing to happen though... :/ Sorry, mate.

I guess all you can do, next time, is make sure you copy the source of your edition of the page before publishing your edit, so as to avoid losing all your data and having to re-enter every thing you'd written in case this annoying glitch shows up out of the blue and ruins your day again. Also, always preview the page before you publish your revision – from what I know, that helps.