Unexpected rounded corners by pocket

Hello everyone,
I'm new here, my fist post, but I read long time, great forum!
My milling machine works for me since two years, I used LinuxCNC and parallel port as control board.
This year I starts to improve my machine and bought Omron VFD, Mesa 7i93, develops two interfaces boards for Mesa.
I install current version of LinuxCNC.
Today I make my first cut with machine. But I was very impressed, it was others as I expected.
My machine don't running in rectangel, it running in arc.
I create model in Fusion 360 and generated G-code.
In simulation of Fusion 360 it looks good, I uses 4mm milling cutter and I create pockets with
rounded corner with 2mm radius.
The passes for mill must be rectangel, not arc.
But my milling machine create rounded corners with radius about 4-5mm.
I try to add pictures toi my post,
has someone any idea, where I make mistake by my configuration? What is wrong?

Best regards
Berlintwin

Look at forum.linuxcnc.org/38-general-linuxcnc-q...m-actual-path#209674

Scott

Thanks a lot, Scott
I try it.

Hello,
after add additional line in *.ini file:
RS274NGC_STARTUP_CODE = G64 P0.015
it runs perfect,
thanks a lot, Scott
Best regards
Juergen

Thanks John,
I want to install your g-code generator and test it, looks good
Best regards
Juergen