Duplicate and array, 8 of 24 parts are ok, HELP

I cut 24 parts, only 8 came out the correct size, the other 16 was not the correct size. The 16 wrong parts was widened and shortened. The shortest of the long edges was legthened by ca 3mm and the longest edge was shortened by ca 3mm.
I started over again in Sheetcam thinking I had done something wierd, but same thing happened again, but this time I aborted after comparing the two first parts.
Anyone experienced the same and have a solution?
Jobfile attached.

Running Mach3, CS-Lab IP/S controller and MP 1000-THC post.


If the dimensions look right in SheetCam it must be a problem with your machine. If it is a stepper machine, try reducing the maximum speed.