I'm getting a weird happening in the Activity Monitor. I have four modules my Outside room, the module addresses are O1, O2, O3 and O4 the timers are set for On at 30 minutes before dusk. If I look at the Activity Monitor it also shows O5, O6, O7 and O8 which do not exist. Strange.
For what it's worth, I see bogus addresses/devices in Activity Monitor quite freqently. I don't know the cause, but I always suspected it was due to multiple macros (or perhaps commands from multiple actual devices) issuing codes at the same time, and causing collisions, which show up in the Activity Monitor as bogus device codes and/or bogus command logs. Unfortunately, I do not know whether this theory holds water; it's only my guess, based on numerous observations.
If the theory is true, then perhaps you saw an artifact of some sort of command collision due to transmissions from multiple sources, that mucked up the actual unit codes, or at least "confused" the Activity Monitor.
Like I said, just a theory, so take it for what it's worth.