set_level causes log duplication

[vivekjoshy]

I was trying to have a different color for my main logger name from it's libraries and discovered that set_level is a culprit that causes log duplication. Is this a bug?

Gist - https://gist.github.com/daegontaven/4353436dc7be3eb9e64e3a8b6ac813fd
Interactive Example - https://repl.it/@daegontaven/VerboseLogs

[ingomueller-net]

I am having the same problem.

Update: I believe that I misconfigured something, but I can't tell exactly what was the problem

[kwuite]

Same problem.