Does this ever happen to you on SW?

I'll be typing along, and suddenly I see the previous page I was just on. But it's just superimposed over what I'm doing now, and if I keep typing, it goes away. Then, if I use my finger to put the cursor earlier in the post or comment window, the previous screen pops up again. I just keep typing, and it disappears again.

It's a very weird glitch that I don't get on any other website, anywhere.