[Gmsh] Geometry surface Quality

[ΓΙΩΡΓΟΣ ΜΑΖΑΝΑΚΗΣ]

Hello every one.

I used to work with .stp files to import the geometry but I have the 
problem that apears in the attachment
I would like to ask why is the quality of the surface so poor ? 
Does anyone know the reason why the surface is not following the lines (I 
use 1000 curves subdivisions) althought the mesh does follow them
Is there any way to improve the surface.

Thanks in advance
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