One side of airpods 4 has more bass than the other

I got my airpods 4 less than a month ago and noticed that sometimes my left airpod has significantly more bass than the other. Sometimes if I take it out and blow on it or rub it off the bass goes back to normal but it has only happened with the left one. I am on a relatively low volume all of the time because the bass becomes irritable. I know it isn't a problem with my hearing because I have used my old airpods to compare and they sound just fine.