Need Help! Machine cutting big circles around my part!

Hey guys, thanks in advance for helping- I've been pulling my hair out trying to figure out why I'm getting these huge purple circles on one of my parts. At first I ignored it since I ran my gcode in OpenSCAM- a CAM simulator- and everything was fine. But at the end of the cutting, it started cutting out the circle around the part. I tried changing my IJ setting from absolute to incremental and that only made more circles... Please help gurus!

Thanks again,
amateur machinist in distress