Buggy Textarea When Posting Long Discussion Threads

Has any fellow Snappas experienced the textarea bugging out when posting a long comment (specifically when your post exceeds what can fit without scrolling down)? I find when a post gets to long and you need to scroll down then it will instantly snap back to the top if you try to type, add markdown or copy / paste something. Ive tried this on both the latest versions of Mozilla and Chrome so it definitely doesn't seem to be a problem that's just limited to one browser.