iPolar on my new CEM40 mount seems behaving erratically. When I set the mount to zero position and do the polar alignment everything looks fine until I move RA axis by 90degrees when iPolar SW moves the aligment target by a lot (like quarter of the screen). Opposite position has different position too. I did calibration of course. When I check polar alignment in PHD2 it's at any position off by about 1 degree. Any idea what might be going on?