[iOS] Opening the camera "destroys" design - Ad banners overlapping

Hello there,
I have an app with adMob banners on the bottom. Everything works fine, until i open the camera.
After that, my design is broken and that causes the ad banners to overlap my design.
Does anyone have an idea, where this comes from and how i can fix it?

This is, how it should be and is, before the camera opens

This is the result, after opening the camera

Thank you