Weird cutting 2nd grip

I set up a image of 1911 grip got everything set on 1st grip did copy and paste then flipped it for the 2nd side put the 2 end to end got all measurements right and scale sainsmart 30-40 machine using drufel download g code an started. 1st grip just acceptable needs tweeking. Moved to 2 an proceeded to cut moving 0 back and cutting slanted to rear top to bottom , completely screwed it up. Any ideas what might have happened? The first was 90 deg spot on. Was just cutting shapes not trying to profile it