SW forces thin feature when extruding circle

Hello,

I am trying to extrude a circle with thin feature box unchecked. Yet, the extrusion comes as a thin feature, which can be seen in sectional view, as shown below.

Extrusion, being a basic command, I have used it many times in the past years, but I never had this problem.

Your help is much appreciatd.

SolidworksParts And Features