Crack on iPhone camera

Whenever I put portrait mode on my iPhone XS Max , a crack appears to be there.

When i look in the outside of the camera , there is no crack on the outside, I have heard from other apple users that they also have a crack ONLY when they open portrait mode.

With the other cámara features there’s no crack , but one appears on only Portrait mode.

And I don’t have apple care.

What do I do?