Replying to Backspace

so i have these problems with typing on this site.
first off, sometimes the cursor just vanishes on me, and wont let me type until i re-click on the text box, but that doesnt bother me as much
and secondly, when i type, and press the backspace key some times, it goes back in pages instead. this results in all my text being lost and having the wait for everthing to load again.

does anyone else have this problem?
and does anyone know how to fix it?
i would appreciate the help