I mainly notice this happening with youtube. Whenever I open a youtube video and start playing it, then open pavucontrol, the volume for that output stream is set to 80% or something. If I put it back to 100% then it resets again if I manually change position in the video or open another video.
Any idea how I can stop this from happening so it stays at 100% volume? I do remember messing with the pulseaudio config a long time ago because I was getting no sound in a game. When that didn't work out I ended up downloading someone else's config and I
think that's what I'm using now.