Hi, just wondering if you have set the FD to the climb attitude before you turn the auto pilot on? I find if I don't set anything to do with the auto pilot before I engage it I get the correct attitude hold after engaging it but, if I try and preset the climb attitude into the FD it will climb like mad when the auto pilot is engaged. Also, when levelling out, I find that I have to use the pitch controller to level out before engaging altitude hold or else when I turn the altitude hold off, the aircraft will often pitch to attitude I had before engaging alt hold.

Cheers