Like I said before, since you are logging the traffic in one of the layers, a log entry will be generated.
It's aware of both layers that accepted the traffic as a result of this.
I'm not convinced the log entries you are seeing in both screenshots are actually different--I believe they are, in fact, the same log entry.
You should visually inspect the log entries to see if they are actually different log entries or if they are, in fact, the same.
If double log entries are getting created, you should see double the number of logs in the Log and Monitor view than when viewing each individual rule.
That said, I did try to reproduce this with R80.20 Management managing a 1490 gateway (R77.20.81) and did not see the same behavior.
My firewall rule that matched had no logs generated, but my App Control layer did.
Only the App Control rule showed as having matched.
But that could easily be a difference between R77.x and R80.10 and you didn't say what version your gateway is.