Logging - Stdout/Stderr is mixed up

[ThraaxSession]

Version of Searx, commit number if you are using on master branch and stipulate if you forked Searx

How did you install Searx?
Manually installed & executed.

What happened?
I use supervisorctl to control my services. I configured the stdout/stderr to each own file. But somehow they are mixed up.
The startup is shown in stdout and each request is shown in stderr.
Exceptions seems to be fine though.

How To Reproduce

Expected behavior
Info logs are printed out to stdinfo. As the look show.