[gradsusr] A bug or am I doing something wrong?

[PEEP]

ga-> q file
File 1 : ../data/Temperature.grb
   Descriptor: ../data/Temperature.grb.ctl
   Binary: ../grad/data/Temperature.grb
   Type = Gridded
   Xsize = 5260  Ysize = 926  Zsize = 1  Tsize = 55  Esize = 1
   Number of Variables = 1
      no2t2m  0  167  ** 2 m 2 metre temperature K
ga-> temp=no2t2m
Define memory allocation size = 38966080 bytes
ga-> set lon 25
LON set to 24.971 24.971
ga-> set lat 60
LAT set to 59.988 59.988
ga-> set t 10
Time values set: 2014:8:12:9 2014:8:12:9
ga-> d no2t2m
Result value = 293.441
ga-> d temp
Result value = 293.939

Shouldn't the results be equal?