Distorted parts out of printer

I have a reality halot sky, i upgraded my software for halot box, I did a test print of a car tyre and found that the tyre was not ‘square’. The tyre was printed on an angle as I normally do, however the side walls are parallel to each other, but the tread is running around ten degrees out.
I have printed another trial, and the problem is the vertical dimensions are being stretched, as if the z axis requires calibration. Any tips from anyone ?