Mark,
What version of Ground control and Maslow Firmware are you running? There was an error in v1.24 that was causing G2 code to run as G3. Which essentially means Maslow cut all arcs as left hand arcs. The update to 1.25 solved this error.
Check this thread to see if you are having the same difficulties: https://forums.maslowcnc.com/t/corrupted-firmware-groundcontrol-using-different-versions-weird-g2-g3-cuts/7527/23
I hope this helps!
Ben