Why have the red and orange colors turned pink on my iPhone 7 Plus?

On my iPhone 7 Plus that I’ve had for almost two months, the red and oranges on my phone have suddenly turned pink. I had set my phone down, turned away, and when I came back, the colors had changed. About five minutes after this, it had reverted back to its normal state but changed back to pink after a few seconds. I am unsure why my new-ish phone would do this and hope that someone could help me out. Thanks in advance.