sometime when zooming it seems to randomly go to optics mode, or swap between zooming and unzooming quickly for no apparent reason. This seems to be an issue with the game, as my input devices(mouse keyboard) are not broken.
The video below shows the second issue with zooming while alt-looking. I can assure you that i am only RMB-holding the RMB, not double-clicking and holding. I dont know if the video helps to show this to you, but ill upload it anyways.
The only inputs i used were(in order):
mouse movement to show i ma not in alt-look mode
altx2
mouse movement to show i am in alt-look mode
sharp mouse movement to the right, whilst simultaneously HOLDing RMB.
mouse movement to show i am in optics mode
release RMB
mouse movement to show i am still in alt-look mode
altx2
mouse movement to show i am out of alt-look mode
sorry if this is too complicated for the small issue