You and me both!
until I looked closer and figured out what's up.
On mine, the entire sight mount is not perfectly level to start with when viewed from the front. Then it's magnified even more by not having the pinholes on the mount line up. When looking from the front, the pinhole on the left side of the mount is higher than the right side.
Front view showing mount base is not level. Red lines added to show location of pinholes.
View from right side. Notice the distance between the pin and top of the sight.
View from left side. Notice the distance between the pin and top of the sight.
