Y axis not squaring to design

hi guys, struggling with a carving issue and not sure where to go form here. I have a basic shape 170mm high which is same as the piece of wood. i am trying to cut a circle 150mm exactly in the y axis centre from top to bottom. the design svg is spot on and the wood is measured correctly. I set my probe and use a bit to get to the wood at 0,0 but when i cut with my 1/8 bit the circle keeps coming out about 1 to 2 mm higher at the bottom than the top so is not centred. ive checked everything i s squeare and all the other usual bits and just cant work out what is wrong. any help aooreciated.

have you calibrated your steps per mm, for each axis?

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sorry, not sure how to do that, or what you mean by that