Default [Q] ringer / nottification sound through headphones

Hi ,

I have searched for this problem but nothing comes up . Forgive me if I just can't find it. My problem is my notification or ringer sounds won't play through my headphones when connected only external speakers. Is this a common problem . my old phone ( sony ericcson neo ) did not have this issue so i find it weird that my HTC one m7 is acting this way. any help or advise would be great. thanks Puddlejumperxxx