Cuts x-axis always 2 mm too short

A few months ago I finished my lowrider. After struggling with loose pulleys on the y-axis, the machine is working great (glue did the trick). Except the x-axis cuts are always 2mm too short. The cuts are straight, so it’s not skipping steps. Is there anyone who also had this problem or knows a solution?

Thanks.

Koen

Below is a gcode I used (first 4 steps were just holes). Dimensions of the part should be 390(y) x 167 (x) mm :

;Project planken
;Created by Estlcam version 11 build 11,228
;Machining time about 00:11:16 hours

G90
M03 S24000
G00 X0.0000 Y0.0000 Z0.0000 F2100
G00 Z5.0000 F480

;No. 5: Deel 1
G00 X138.8013 Y-1.5875 Z5.0000 F2100
G00 Z0.5000 F480
G01 Z0.0000 F192
G01 Z-7.0000
G01 X167.0001 Y-1.5874 F720
G03 X168.5876 Y0.0001 I0.0000 J1.5875
G01 Y28.6320
G01 Y33.3945
G01 X168.5875 Y426.0001
G03 X167.0000 Y427.5876 I-1.5875 J0.0000
G01 X139.6409 Y427.5875
G01 X134.8784
G01 X31.3305
G01 X26.5680
G01 X0.0000
G03 X-1.5875 Y426.0000 I0.0000 J-1.5875
G01 Y323.4818
G01 Y318.7193
G01 X-1.5874 Y70.3377
G01 Y65.5752
G01 Y0.0000
G03 X0.0001 Y-1.5875 I1.5875 J0.0000
G01 X34.5443
G01 X39.3068
G01 X134.0388
G01 X138.8013
G01 Z-14.0000 F192
G01 X167.0001 Y-1.5874 F720
G03 X168.5876 Y0.0001 I0.0000 J1.5875
G01 Y28.6320
G01 Y33.3945
G01 X168.5875 Y426.0001
G03 X167.0000 Y427.5876 I-1.5875 J0.0000
G01 X139.6409 Y427.5875
G01 X134.8784
G01 X31.3305
G01 X26.5680
G01 X0.0000
G03 X-1.5875 Y426.0000 I0.0000 J-1.5875
G01 Y323.4818
G01 Y318.7193
G01 X-1.5874 Y70.3377
G01 Y65.5752
G01 Y0.0000
G03 X0.0001 Y-1.5875 I1.5875 J0.0000
G01 X34.5443
G01 X39.3068
G01 X134.0388
G01 X138.8013
G01 Z-21.0000 F192
G01 X167.0001 Y-1.5874 F720
G03 X168.5876 Y0.0001 I0.0000 J1.5875
G01 Y28.6320
G00 Z-14.0000 F480
G01 Y33.3945 F720
G01 Z-21.0000 F192
G01 X168.5875 Y426.0001 F720
G03 X167.0000 Y427.5876 I-1.5875 J0.0000
G01 X139.6409 Y427.5875
G00 Z-14.0000 F480
G01 X134.8784 F720
G01 Z-21.0000 F192
G01 X31.3305 F720
G00 Z-14.0000 F480
G01 X26.5680 F720
G01 Z-21.0000 F192
G01 X0.0000 F720
G03 X-1.5875 Y426.0000 I0.0000 J-1.5875
G01 Y323.4818
G00 Z-14.0000 F480
G01 Y318.7193 F720
G01 Z-21.0000 F192
G01 X-1.5874 Y70.3377 F720
G00 Z-14.0000 F480
G01 Y65.5752 F720
G01 Z-21.0000 F192
G01 Y0.0000 F720
G03 X0.0001 Y-1.5875 I1.5875 J0.0000
G01 X34.5443
G00 Z-14.0000 F480
G01 X39.3068 F720
G01 Z-21.0000 F192
G01 X134.0388 F720
G00 Z-14.0000 F480
G01 X138.8013 F720
G00 Z5.0000 F480
G00 X0.0000 Y0.0000 F2100

M05