I'd need to take a look to know for certain but my initial thought is your perspective being disabled. Is your perspective enabled on your camera?
The calculations are balanced with perspective in mind, but if that isn't on then the front and back wouldn't actually change the distancing and the offsets would shoot them in whichever direction if you tried to use them.
My second thought is I goofed up the transforms somewhere. It's entirely possible that I goofed up one of the transform coordinates and no ones ever caught it.