Volume changed in all music?

Two days ago I noticed that some downloaded songs had apparently changed, when one song finished playing the next one played at a lower volume. I started testing a bunch of my downloaded playlists, and noticed lots of songs that really did play at a lower volume. I noticed this mainly because I listen to the same playlists in the same order pretty much daily, and having some songs randomly play at a lower volume is something I can easily notice.

I ended up deleting all my downloads and then downloading some of them to continue to test, and also tested streaming songs without downloading them. I found out that the songs that had lower volume were maybe like half of the ones I tested, and they seemed to be random, the ones that started playing with that lower volume. I then tested deleting all YTM app info and disabling it and then reenabling it, and the same thing continued to happen. I also tried different BT devices, forgetting some BT devices and pairing them again, and the same thing kept happening. I didn't have any other phone to test this in, so I chose to factory reset my phone (I honestly listen to music all the time so I need my music to play consistently, so I had to try this as well).

When I set up my phone again I started testing again, both streaming and downloading music. To my surprise, ALL music is now at a lower volume, doesn't matter if downloaded or not, and I know this because I know my BT earphones in and out, I know at which volume I can listen to everything around me while also listening to music, and now I have to raise the volume 2 levels for it to be the same as before.

I honestly have no idea what could be going on, and couldn't find any pending updates, either for the YTM app or the phone or my BT earphones. Has this happened to anyone else? Any ideas as to what could be causing this?

Tldr: music from the app now plays at a lower volume than before, no idea why.