iPhone XR has faint line on curve of LCD?

I noticed this a couple months back but never really cared much, but I noticed it again and I’m just curious if anyone has had this happen as well. I’ll include pictures, but at the bottom left corner of my screen is a shadowy line that follows the curvature of the LCD but keeps some space between it and the edge. It’s only visible on lighter colors and while I do have a screen protector on, I don’t believe it caused this. Any ideas?