When you add float to a position:absolute element, of course it will have no effect :).
Your page is constructed pretty poorly. You have a rightbar element, however, even though it's floated, the content in there is absolutely positioned, without coordinates. Honestly, your rightbar wrappre isn't doing anything besides being a marker as to where the browser thinks you want the AP elements set.
Why do you have the elements set to absolute position anyway? There is no need for it, and quite honestly, they don't belong there.
As to your issue, What exactly is being dropped down? Everything looks "normal" over here using FF. Both the wrapper and the rightbar element both start up at the top of the page.