DXF Import in FlashCut: Milling circle interior

Hello,

I have a simple problem, but need some help to figure it out. I drew
a simple circle in ACAD, saved it as DXF. I imported into FlashCut
CNC and simulated the program. It only milled the edge of the circle
to 0.25", but it didn't mill the interior.

Is this an import option that I missed, or do I need to draw it
differently in ACAD?

Thanks,

Ken