-126 dBm i dont think it will be in dedicated mode is it?
according to parameter settings -check rxlevmin-(and also not sure but gsm specifications) this is not allowed.
if dtx is not in use just look rxlevfull what it shows
for the colour, if u select rxlevsub to show on map it shows blue that is ok because dtx is not in use at that time and rxlevsub is useless