I not understand what is happening with my system and my sound

It's getting crazy. I used to have my volume set at 30 out of 100 and it was nice and loud; NOW, I have to put the volume at 40 at it's so QUIET-

When I edit my videos through my editor, I edit the sound so it's PERFECT on my side. But MY SIDE is not reporting things ACCURATELY- when my video sounds PERFECT on my side, I render and upload-

and it sounds all WRONG- my voice is too loud, the game volume is too quiet- I do NOT understand what is happening, I just don't want to have to reinstall again. It's only been like 2 months since I had to re-install Win10- this is nuts!