Gumball Extrude Curve Into a SubD Srf problem

Hi Im really confused. I added a control point to a closed curve and somehow when I use the gumball extrusion on the curve it turned into a SubD surface, while if I use the extrudeCrv command on the same crv, it is a regular nurbs srf. I don’t know if I messed up my setting somewhere. Can I keep my gumball extrude always to nurbs srf somehow?

Hello- please post a file with the curve.