corner cutting problems

my atomstack x30 pro… is not precise in the corner cuts. If I try to cut a square under left and alt right it makes the vertical cut wrong. as diagonally in the first millimeters. I’m a newbie, probably something is wrong. The straps seem tensioned well.
thank you

Please include a photo of the output.

and the circle cut is not correct.
thanks for the reply

If you think about it, your computer is stepping 2 motors equally for the circle. If the circle is not round, then the motors aren’t following the signal. Typically, if the motor was at fault, it would be an oval but would have a little more pattern to it. What this looks like to me is a loose laser head and friction on the cables/air tube causing it to flop around or loose pulleys/belts leaving too much slack when the motors change direction.