contour lines are generated offset

[peppons]

Hi,

I generate contour lines with the workbench geomatics, and they are generated offset. How I can generate correctly? I use Windows 10 and FreeCAD 0.19.
First I import points from a text file with this structure "name,x.xx,y.yy,z.zz,coment" .
Second I generate DTM with create surface option.
Third, I generate contour lines with the create contour options.

The result is the one shown in the attached file

pregunta.png (139.83 KiB) Viewed 1245 times

Thank you in advance for your answers

PD. Sorry for my broken english