Contour lines with imported shape file using Blender GIS - wrong Z values

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I've been making experiments with Blender GIS and QGIS.

I'm having problems when importing Shapefiles with contour lines, with a field for elevation (ELEVATION FROM FIELD selected when importing).

I'm describing them below (Blender 2.75 and QGIS 2.10).

1. When there are contour lines that have no value for elevation (in QGIS for example, Z is NULL) mixed with contour lines that have values, Blender GIS cannot load the SHP. This is no real problem actually, since it's easy to fix in QGIS.
   
   
2. Now the real problem: when I import a SHP into Blender with all the contour lines with Z values, it worked with a SHP with only 3 contour lines (3 features in QGIS), with Z values 20, 40 and 60.
   
   

But when I imported a SHP with 49 contour lines (49 features in QGIS) with Z values from 0 to 800 (20 m interval), the import result was very messy. It apperead that the contour lines assumed random values, but still inside the original values from the SHP.



Now the fun part: when importing, instead of selecting ELEVATION FROM FIELD, if I select EXTRUSION FROM FIELD, everything is right.



Then I can just delete the 0 value vertices and I end up with just the contour lines in the right Z position (so I can apply Delaunay triangulation to have a surface).



So, conclusion is, I can reach the final result I want, but it needs a bit more working.

Anyone have an idea of what is going on with ELEVATION FROM FIELD selected?

Thanks in advance.



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