I'm not seeing that issue. Never have in Chrome.
Seems really quiet strange. There really isn't anything in the forum software that would move the cursor around or create extra lines.
I have seen those little touch pads on laptops cause issues though when they are touched inadvertently while typing.
I hate them on general principle and generally use an external mouse even with my laptops. In that case, I shut off the touch pad so that kind of thing doesn't happen.
Programmer - An organism that turns coffee into software.
If all your friends are exactly like you, What an un-interesting life it must be.
"A door is what a dog is perpetually on the wrong side of" Ogden Nash