Good afternoon, I bought these headphones for my son in advance for his birthday, yesterday I gave him these headphones (I myself do not understand them), he showed me that in one earphone the sound is louder than in the other, especially on the bass (as he explained on low frequencies), I listened and indeed the sound is quieter in the left ear, they checked it on different devices, it is uncomfortable for him to work in them because of this, and I don’t want to spoil his ears, what should I do?