GCC Spirit Cutting Acrylic wavy lines

[Talbi el alami mohamed]

Hi ,
I am experiencing wavy cuting in my GCC Spirit 100 Watt.

The cutting is ok in Y axis but Wavy in X axis. I have changed all the Bearing on the X Y Axis.
I have attached photo
403366403367403368.

Any solution to this problem.

Thanks in advance.