CDO

Dear CDO users,
I intend to extract temperature values of points (lat/long) from netCDF files . The input file hourPortC.nc is limited by lon [-9.52 -6.22] and by lat [42.12 36.92].
Something wrong is happened :
when I use lon/lat without decimals
cdo -outputtab,date,lon,lat,value -remapnn,"lon=-9.0_lat=39.0" hourPort.nc > output.csv
I am getting correct output like this:

1. date lon lat value
   2017-01-01 -9 39 278.442
   2017-01-01 -9 39 277.92
   2017-01-01 -9 39 277.395
   2017-01-01 -9 39 276.99
   2017-01-01 -9 39 276.654
   2017-01-01 -9 39 276.29
   2017-01-01 -9 39 275.985

But when I use lon/lat with decimals
cdo -outputtab,date,lon,lat,value -remapnn,"lon=-9.43_lat=39.38" hourPort.nc > output.csv
cdo give me wrong output :

1. date lon lat value
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   2017-01-01 -9.43 39.38 -32767
   What can be wrong?
   Many thanks.
   Natalia