Android - Shadow on mobile, not on PC. *SOLVED*

Hello everyone, TitleByte here.

I'm currently working on a game for iOS and Android and have noticed a problem that I have not been able to solve.

When I play my game on Android, there is a shadow going through the entirety of the middle of the screen as a horizon, blackening half of the screen. When I play the game a bit, I also see a strange lighting effect that is not present when I simply test the game in Unity.

I'm getting the strong feeling that there's some kind of settings that the Android APK builder is importing that I cannot find anywhere nor have created myself. In the hopes of trying to fix it, I have fiddled a lot with all different options in the Quality settings. I have also tried fiddling with my lighting in the game as well as the game's camera.

Does anyone know how to fix my problem? I'm out of ideas.

Pictures: (Left is PC, Right is Android)

So on the right, there is a shadow going through the middle. (This is not because of bad lighting in my house or something else external) The light stroke on the Android version showed up because I used another older phone to take a picture of the android version.

Any help is highly appreciated.

-Luke (TitleByte) van Wensveen