Lifeproof case for Iphone 5s problems?

I just got a Lifeproof fre case for my iphone 5s and I have some questions.
Is the built-in screen protector supposed to sit directly on top of my iphone screen?
Because the black plastic piece over where the proximity sensor should be is way too thick.
Therefore it causes a space between the screen and the case.
But it confuses me because it only causes space in the top 1/5 of my case, the rest of the
case lies perfectly flat with my screen. I searched around on google but I didn't see that
anyone had a problem like this… Is this normal?

I have an otterbox so I'm not sure, my suggestion is email lifeproof and see if they can help you resolve this.