Does every rog phone 3 has it?
Is it a hardware issue or a software issue?
Red Tint may depend on the user to user as there are different screen optimizations. Red tint or slightly different display behavior is evident in high refresh rate displays. You can use the inbuilt Splendid App to tune the display as per your requirement.
Do note with every update the display is optimized. If you still are not satisfied you can visit the service center for more help.