I've noticed a problem reoccurring with BobCad 21 (21.5.3)

When machining a circle I've had the finished result very far from what I initially designed.

The resulting toolpath is distorted and usually if not always resembles two half circles one above the other but not concentric.

Any ideas?

I'm outputting to Mach 3 and the messed up file is visible on the Mach toolpath screen.

Note, the attached file was a perfect circle drawn in BC 21 then used the offset feature to create another series with the same center line.

Notice how the "circle" is no longer a circle and now a series of arcs and the center is no longer at "0,0,0"

What's up with this?

Frustrated!