Regarding the volume slider adjusting when scrolling up or down: it sounds like the volume slider is focused. This can happen when, for example, you've just adjusted the volume. Try clicking somewhere else in your screen and then scroll to see if that does the trick for you.
If it happens continuously, even without having used the volume slider, we'd recommend performing a thorough reinstallation of the app with the steps here. This can help remove any corrupted cached files that might be causing this, starting afresh.
Hope this is helpful but don't hesitate to give us a shout if there's anything else we can help with!
Have a lovely day 🙂
Help others find this answer and click "Accept as Solution".
If you appreciate an answer, maybe give it a Like.