When clicking right mousebutton to change to optics of my weapon, the direction in which I looked before is chancing. It changes aprox. 45 degrees to the right or to the left. That is very bad when I was aiming at an enemy and have to re-locate and re-aiming after changing to the optics.

Same happens sometimes when I am looking through the optics and clicking and holding right mousebutton to hold breath: the direction of sight does not stay focused but is drifting away to the side so that I have to re-aim. Often enough a death-sentence for me.