Vertical Scroll Bar in IE8 appears to be at the center of the page in Wiki Markup

Using IE8 (specifically only in 8.0.6001.18702), the top bottom scroll bar appears to be at the center of the page instead of at the right side during editing a page in Wiki Markup.

Please see attached screenshot (IE8_bug.jpg).

This bug only happens in Confluence 3.2 only (tried in 3.1.2 and it works normally). Trying with IE8 (8.0.7600), the top bottom scroll bar works normally. Besides, it happens on all Confluence themes.