The best thing to do in these circumstances is to post a screen shot so that people can see your noise floor and settings. Please note that SDRuno (unlike other SDR software) always shows power in dBm as referred to the antenna port and not dB or dBfs. Most other software uses dBfs (dB relative to the ADC full scale). When you refer to the noise floor, are you referring to the visual level as indicated on the spectrum display or that indicated by the power meter? They will be different (for very good reasons).