Need to see a screenshot showing what you are seeing. We cannot duplicate what you are describing.
Now there is something different with VR which occurs if you get your head position too close to the gun sight. It should up on the B25 gun sights. When you get close to the gun sight it cannot be drawn for both eyes without splitting the reticle.
In the B25, you had to move your head left or right and close the other eye to get the crosshair in view.
We have instituted a work around for this, but it will require each plane to be changed and we need to know which ones are effected. The P51D does not seem to fit this issue, so we are at a loss as to what you are describing.