Sheetcam wont generate correct code for circles 20" and above

Hello. I have sheetcam 6.0.30 and I am using Mach3 version 3.043.066 with a plasma table. My problem is when I attempt to cut a circle 20" or larger sheetcam shows a full circle on the screen complete with cut in and cut direction but when I post process and open in Mach3 it just shows (and if I attempt just cuts)the lead ins. I have tried for circles smaller than 20 and they work fine. Is there a setting somewhere I need to adjust? Any help would be appreciated.