Strange signal strength values reported by Airport Utility

I am finding some strange signal strength values displayed by the Airport Utility (under the "Advanced" tab):
Client Signal Noise Rate Type
1 -24 -95 54 802.11b/g iPod Touch
2 -59 -90 130 802.11b/g/n MacBook Pro
3 -24 -95 54 802.11b/g Dell laptop
4 -24 -95 117 802.11b/g/n Airport Express
The four wireless devices are all approximately the same distance (about 4 metres) from my base station (another Airport Express).
What seems odd is that:
- Three of the devices show EXACTLY the same signal strength (-24 dBm signal, -95 dBm noise). The graphs are dead straight lines with no wiggles. If I move the iPod away, for example, to a distance of 10 metres, the figures remain at exactly -24/-95.
- The MacBook Pro values behave in a much more reasonable way. The graph has small random fluctuations (and an occasional large peak). If I move the MacBook further away, the signal level drops, as you would expect.
I should be interested to know why the values displayed by Airport Utility make sense for the MacBook, but appear to be nonsense for the other three devices.

The signal strength values now behave as expected. This was probably a result of a Mac OS X update or Airport firmware update. So, I am marking this issue as answered.

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