Without argueing whether or not something is off in AirMarshall, often people tend to confuse dB witth dBm (or dBW or any other measurement). Decibel, or dB are generally just a measurement of ratio, or gain as @alemabrahao also notes. When we talk about a change in 10 dB, this refers to a change in order of magnitude, while 3 dB is a change in 2's +3dB is times 2, while -3 dB is times 0.5). When we talk about dBm, this is a measurement of change in decibels in reference to milliwatts. If the reference point it watts, it'll be dBW. Honestly, showing neighbors or rogues seen by own Access Points with a measurement of dB, doens't really make sense to me. A measurement of 137 dB could be a lot - but it could also be insignificant. It depends on the frame of reference. 137 dBf, and no one bats an eye. 137 dBW, and you're cooked. Well done, even.
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