X axis distance gets shorter


I am installing a Laser Tree laser head. Tested on a square engrave and found the x axis alters its distance.
It starts fine, up, left, down and then right towards home but stops a couple of mm before it should.

If I do a 2 pass engrave it does as above and then carrys on up, right, down and then left to where it started the second engrave.
I am unsure what to check i have done the steps on y axis but x axis I have nothing to work on. Is connected to the new laser head? If so i cannot see why. Have included a photo to hopefully make it clearer. Thanks for taking the time to read this, hopefully you will have an answer.

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