You didn't realize that it is updown-side, convolut-erted, back-asswards and inver-sided-ways?
I know the gunsight is mounted upside down. However, what he said sounded like he thinks the gun ballistics curve has been tied to the gunsight and it "inverts" (thus lobbing rounds low) when you look through the left and right gunsights. This is wrong.
The guns are not tied to the gunsights that way. It's not how any gun in this game works. The gunsights are off because 1 of 2 things: 1) the gun is not physically where the gunsight is, and they must converge. Outside of that convergence they will not meet up. Or 2) there is a bug in the gunsight so that the graphical representation of the "pipper" isn't quite centered. This rarely ever happens and is easily spotted by HTC and fixed rapidly.
So far all the evidence points to option 1. User error and misinterpreting what they were seeing.