for righthand drive cars, only the left hand side mirror is desgined to tilt. the right hand side mirror doesnt tilt as your right side vision is wider being on the right hand side of the car...
anyway, if you do not want the left hand side mirror to tilt just do the following:-
u know the button to switch the left or right side mirror to adjust the tilting, switch that to the opposite side...hope u know wat i am talking about bro ;-)
if you still do not know wat the above instruction meant, read the manual it is inside there bro...