Sound quality during youtube

So I wear my airpods to my phone, and went on youtube, when I noticed the sound wasn’t clear while watching videos. It was muffled and the volume controls were messed up, if I turned the volume way down—I would instead hear medium volume like what you would hear if the volume was turned to the middle.

I did this for other apps, and it doesn’t have the same problem, only youtube.

On youtube, I would swipe up and check what’s going on in the airplay.

There were two connected airpods? And if I were to tap on the other airpod connection. Then this’ll popped up.

I don’t know this “(null)” thing, but if I tap on “Replace” then it’ll still get me that same muffled up sound. Does anybody know how to fix it? Any help/comments appreciated!