Audio [Q] Earbud Output

Hi. I recently got the Griffin Wood Tones headphones to use and they work really well with the Lg G2, but there is one minor problem. I am not sure that it is just for this pair of earbuds, but whenever i get a notification sound with my earbuds plugged in, it comes out through the speaker. I first noticed this in class when we were doing work and I was listening to music. It was really embarrassing having your phone go off in class. I was wondering if this is normal and i can change it somehow or if it is the earbuds that make it do that. Thank you!