Cesar,
The first point should be (0,0). Try to expand the axes scales so you can see the points more clearly. You can also try probing the wires and run in execution-highlight mode.
If you're still seeing the first point as (0,1), then post your sample VI so we can take a look.
Regards,
-Khalid
PS: For LabVIEW specific questions, you may want to post in the
LabVIEW forum.. for better 'n faster responses.