It happened to me, too, haha.

I was just finishing up an entry for Hetalia Daily when I decided to check if my HTML was typed up properly. After I shifted into the Rich Text Editor, lo and behold, half of the text I typed just vanished into nothingness. I almost flipdesked, ngl. ||OTL

Now, I just stick with the HTML editor and use the Preview button to see if my coding is all accurate.