Ya .. I also get messed up entries in airodump-ng. I think that's due to interference, low SNR, low signal, poor wifi card sensitivity .. etc. Actually I know that from one of AP in my area of which I do know it's location. When I get closer to it everything it's ok, when I go to the other side of the house only the BSSID is correct .. the channel is 108 !! , the SSID is "length: >0" and power is -1 dBm.