played around a bit and found out: i use enfold child but same happens on pure enfold.
yet, the columns appear alright when, on the same page, a right sidebar is placed.
Ah yes sorry about that! the page is http://goo.gl/IUq3v9
checked w/ native IE9 just now..looks the same as in VM :(
oh and (forgot to mention). WP 3.6 with enfold 1.9.1. falling columns occur with ALL plugins deactivated. thanks!