Ooops, I misread... I thought u meant when switching Profiles...
Yup, on game start, the sound volume is be not correctly fixed when the game window isn't active (it's the case when launched at the end of the install process), but if you launch the game normally & wait for it to load without switching to another window, usually, it shouldn't happen...
And I already tried to fix this bug, but it seems it doesn't work...

I'll try another fix for next update...