Horsing around with the Create Objects from Shapes >Walls.
Source poly (Side 1.) was made with polyline tool:
Straight segment on y axis, then Tangent Arc vertices with tangent click on y axis.
Side 2. is duplicate, moved over, then direction reversed.
The command seems to depend on direction of the source poly. Side 1 funky, Side 2 just right.
Known problem/bug? One can delete the walls and reverse the poly(s) and run the command again. Or is there another strategy?
Either way, I think the initial direction should not matter.
-B