Hi guys, am I the only one having major issues with being able to sight in a red dot? Trouble is, all the optics I've bought under 100 dollars, refuse to be sighted in. What I mean is, the dot won't move to the middle. It seems the dot will go down slightly when turning the right knob, and slightly up for the left. As a result, the dot will not go in the middle. It has happened with each and every optic, and is getting on my nerves. Now before anyone says I don't know whatim doing, I have sighted in numerous scopes before, easily n an someone please help me?