Motorola E8

Is your E8 camera sensor off center when you look at the phone with the back plate on? The sensor is 100% centered behind the glass on my phone when the back plate is off. With the back plate on, the sensor sits a little down as well as a little left from center. My E8 never dropped or bent or anything. I care a lot for my Moto. How firmly do you push down the back plate when putting it on? I never pushed to hard because I worry too much that I could put way too much pressure on the front and the whole device itself. Is it possible that the back plate needs a harder pull for getting to its correct position or is the off-center issue normal?