My Apple earphones fit, they just don't carry that much sound. Set at the highest volume, some songs/podcasts are high volume while others are so low I can hear

My Apple earphones fit, they just don't carry that much sound. Set at the highest volume, some songs/podcasts are high volume while others are so low I can hear everything around me better than what's playing. Half the time, I walk around almost cupping my ears just to hear.