Mic gain randomly going down

[Speedbird612]

Hi guys, just noticed on stream than the audio of my mic is randomly going down for no reason. I mean not the cursor but the audio level itself it change from being right at the begining in of the yellow area to being way down in the green area. It seems that it has something to do with the mic level on windows since when I change the gain into windows it comes back to normal (I actually reset the windows gain to the same value). I don t know from what this it is coming from, it looks like it wants to come back to a default windows value Idk or maybie it s my limiter who making it go down.
Here is some screenshots of my settings and filters (sorry it s french) and my mic is a Rode NT usb (it s an USB mic, I don t have a soundcard).