It is a little out of the normal type situation. But if your headphones are recognized, can you go to the playback devices (right click speaker icon) and make changes to the properties or configuration of the headphones?
Can you change the volume? Do you have volume sliders for specific types of sounds in the mixer?
Is it only on You Tube the sound problem occurs or with Media Player also.
The music in the background might be some type of bleed through you can hear because he headphones are more sensitive, especially at high volume levels.