You’re the first person with that problem. Do you mean loudness is inconsistent between tracks? It used to be inconsistent but for over a year most tracks should have normalized loudness within reason. Or are you talking about something else?
What was happening was I changed the music volume to what I wanted it to be at (about 13), then when the track changed it would start playing at the default volume (50). I had to go back and change the volume slightly to get it playing at the correct volume again. This happened a few times. Weirdly I can't reproduce it anymore. Maybe it only happens on first run?