I seem to be having a problem when cutting pipes with sheetcam rotary.
When then notch is at X0 Y0 it messed up the gcode as seen in the image.
But when i move the dxf off X0 then the problem Sometimes goes away.
I can confirm that the S1 start point at X0Y0 of the flattened drawing can be finicky. Its best to avoid that coord as S1 if you can.
Send us a support.zip file to have a better look.