jQuery UI Draggable scroll issue - jquery-ui

The problem with my function is that when I scroll down, the clone of the element I want to drag is positioned under my mouse pointer, this only happens in FF, IE and Safari, Chrome works like it should.
I already tried all answers on this question :
jQuery draggable shows helper in wrong place after page scrolled
But without succes,
I use jQuery 1.8.3 & jQuery UI 1.10.3
hopefully anyone has any idea on how to fix this.
You can view a live version of my webpage here : http://www.solar-sell.eu/uw-pv-systeem/?gezin=true
The people are the draggable elements and the house is the drop area.
Thanks in advance!

It seems to me that the problem is a jQuery UI bug - http://bugs.jqueryui.com/ticket/9315

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