Gap between case and screen

Hi, bought an iPhone X two months ago, and always worn in the official Silicone Case. When I removed the official Silicone Case from IPhone X, I noticed the gap between the screen and the case. I hope you will can see that gap on the photos.This gap is only on the right and left side.

I can feel this gap when I move my finger from screen to case.

Maybe somebody have similar problem?

I from Ukraine, Lviv. I think we don't have official service center