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parkr4st
en respuesta a: Karol-Or

I opened your dwg

a new layer current and BOUNDARY, click inside your work and the boundary is made indicating all your work is on one plane.

UNDO that

 

I find two polylines and two arcs,  no splines

JOIN joined and converted into one closed spline

 

are you asking about the Normal Z of negative value in properties?  some explanation in these posts.

 

https://forums.autodesk.com/t5/autocad-map-3d-forum/normal-z/td-p/636762

 

https://forums.autodesk.com/t5/autocad-forum/normal-z/td-p/6484069

 

dave