Hello Sosaboi,
We see you have a concern regarding a tint in the display of your iPhone, and we'd be happy to help out.
Are you utilizing Night Shift and/or True Tone on the device? You can check for these in Settings > Display & Brightness. If ether is on, try disabling them, and see if you can still replicate the tint. This can help to note if it's linked to either feature. Details on Night Shift can be found here: Use Night Shift on your iPhone, iPad, and iPod touch
True Tone will be covered in here, for referencing: Adjust the brightness and color temperature on your iPhone, iPad, or iPod touch
Cheers.