having issues with replies.. text moving down and out of sight

I've noticed since the update that when I reply to posts and I have to go up a line or two to make a correction or add something, then go back down to the line I was on.. the text seems to drop off the page, you can't see where you were or what you're typing, and when you hit the "enter" button (return tab) to keep typing, the page gets all jiggly.

On this post now, however, I'm not noticing it. Could it be in the break room only? Weird.
But I've had this issue since the update. Any ideas? Thanx!