Why is everything tinted orange?

[Snaukball]

This does not seem to be temporary, many things like the phone apps number pad button is orange instead of blue, my backspace, comma, period, shift, and numbers keys on my keyboard are an unnatural colour of gray, and the search box on Google is also orange. I am using an OPPO Reno5 and can't seem to find a solution to this.

I expect this to be happening because of my most recent update, but can't seem to find out why.

 

[Snaukball]

I have since fixed this, but do not know how.

 

[Ben xfg]

I have since fixed this, but do not know how.

Maybe you flipped an invert colours switch somewhere.

 

[belodion]

Yes, there are things in Settings, Accessibility that may be relevant. Try them, to understand their effects.