I have the following setup and when I set the clipping area to anything other than "None" the gizmo moves from completely covering the camera to centered on the top left. It seems to be reapplying the anchor but only for the clipping area (Everything else seems to be in the same place as before).
Camera
--UIAnchor (TopLeft)
----UITable and UIPanel and UIDraggable Panel (set at position 0, 0, 1) <----Clipping issue on UIPanel is here.
------ItemA
------ItemB
------...