Sound adjustment

As i try to adjust the sound on the option screen while in the game (not in the client) , I try to click the mouse on the point that i need (in the H.scroll of the sound ) , but it shows it in another location that is far from the point that i need to click on it . My resolution is 1280*1024

Steps : while in game 1 - press ESC button 2 - switch to sound tap 3 - try to adjust the sound volume by clicking on any point in the H.scroll of any sound volume (not by dragging it)

Sorry for the bad language , good luck and I hope u figure this out and solve it as soon as possible