Minimum RPM of fan can't be set below 5200 RPM

When I power on my MacBook Pro, the fan immediately starts to run at 5700 RPM. No significant cpu load (2-4%). PRAM and SMC resets have been performed several times without effect. I use the app "Mac Fan Control" to monitor and control the fan. Somehow the minimum RPM that can be set for the fan is 5200 RPM, which is rediculously high.
The screenshot shows I have set the RPM to a constant value of 5200. The problem is that I cannot select a lower value. Also sensor-based or system managed ways of fan management do not lead to lower RPM
My question: Who can explain how I can (re)set the minimum RPM for the fan back to 2000 RPM?

Thanks guys.
To clearify my original message:
1. First the fan started to behave weird. Only then I installed fan control apps. I am not trying to outsmart engineers. No intention to overrule Mac standard settings.
2. The fan is not only running at 5700 RPM at startup, but from startup until shutdowns. Continiously.
3. After your comments, I uninstalled the fan control apps, rebooted (even reset SMC again). No results :-(

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