Me and my girlfriend both recently purchased flutes and when trying to play b sharp on my flute I noticed the sound wasn't coming out right. All the pads seems to be fine and the keys move good. But what I noticed is that when I press down either the second key on the right hand or the second thumb key it presses down two keys near the left hand whereas it only presses down one on my girlfriend's flute. This makes the b sharp sound like a normal a. I don't see where I can upload pictures or I would. Any help would be greatly appreciated, thanks.
Edit: B flat