[Gmsh] Missing surface label and duplicate surfaces

[Alessandro Vicini]

With reference to the attached contour.geo file (including background.geo which is merged into it), gmsh does not show surface #14: the label is not shown, and also its graphic representation as "cross" is not visible. 
Moreover, when I generate the volume some of the surfaces are duplicated; this gives me troubles with my own pre-processing of the msh file, is there some way to avoid it? Thank you.

Alessandro
 
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