draggable/sortable position problem over iframe

draggable/sortable position problem over iframe

Hi.

I have a annoying problem with some draggable element witch is connected to an sortable list in an iframe.
The draggable items are located on the right side, when i drag one and move it to the sortable it suddenly jumps about 300px to the right side. This happens when it's connected and moved to the other list in the dom. In this moment css left jumps from (for example) -1000px (because i moved it from the right side to the left) to 300px oriented on the left side of the iframe. I have no idea why this happen, does anyone has some idea how to handle this?