Can't change Voice Transmit Volume

So my mic is loud in Garry’s mod…
I try to change the transmit volume, but when I move the slider to the left, hit apply, and hit ok. And go check back at the options, it’s all the way to the right. I don’t wanna be annoying, but I don’t know how to fix it.

Do you have any sort of Logitech mic managing system?