After updating to One UI 8, the sound became quieter.

I upgraded my headphones a couple of days ago, and the sound got quieter. Then I upgraded to One UI 8, and the sound dropped completely. Before, it was already really loud halfway through, but now you can turn it up to max. Plus, some songs sound fine, while others are super quiet. Before, I repeat, they played perfectly. I didn't touch any settings or anything.