Remember, the tool sees ALL SSIDs in the RF range. I live across the street from a school and see it has deployed several unique networks. I too have seen networks move to channels I am using and if I move, they do too (but not instantly; eg SpectrumWiFi, SpectrumWiFi Plus, CableWiFi, TWCWiFi Passport, ...)
I see only ONE unnamed SSID -- that only means the name is not being broadcast which is an option and not unusual.
I monitor not only concurrent (co-channel) usage, but comparative signal strength. For example, I'm running at -62dbm while the concurrent is at -92dbm -- that's -30dbm
and it drowns that data.
The adjacent channel is at -77dmb and -15dbm down.
Monitor the box upper right:
- Channel xx Link Score nn
- Co-Channel yy
- Overlapping zz
IMO, an ideal configuration would be a very high Link Score, 0 Co-Channel, 0 Overlapping