The microphone's value cannot reach level 5

[smfox10]

v2.5.47

The microphone's value cannot reach level 5
This is the microcode program:

I tried to test it with a program from the makecode platform and got a maximum value of only 202 for the microphone (even though I was blowing the microphone very hard)，, so maybe it's a problem with the mapped maximum value?
This is my test program:https://makecode.microbit.org/_MKVPzvR6uXUo

This is what I get for the max value of the microphone