I have tree-like comments enabled. The Reply form is moving by the script from file wp-includes/js/comment-reply.js
The form is moving correctly in any browser except Internet Explorer 8.
Please look at this page: http://irma-otto.com/%d0%b3%d0%be%d1%81%d1%82%d0%b5%d0%b2%d0%b0%d1%8f-%d0%ba%d0%bd%d0%b8%d0%b3%d0%b0/
If you press the «[Ответить]» link («[Answer]»), then Reply form in IE8 will overlap other text (comments). To fix this you can, for example, select text from comment before the form to comment after the form. After selection/deselection page looks OK.
Why this is happening? I hadn'n know that text selection can modify page layout. Where I can read about this?