Started a new game in 0.13.12. No mods.
Normal
I then disconnected the central red wire. Reconnected.Doubled signal
Mouse over any powerpole now says A=2. It should be A=1. I removed part of the network.
Phantom signal with just powerpoles
Now I have a signal that stays around despite no actual source at all.Additional thing to test: Just delete the constant combinator in the original picture. The signal A=1 now says.
This is strange. I half suspect that something is seriously wrong with my install that steam verification didn't catch.