My screen colours went funny while watching a YouTube video. I initially restarted the device to resolve it but now its seems to be permanent. I've reset SMC as well as NVRAM/PRAM

I've connected it to a external display monitor and the issue doesn't appear on it. It must be the internal display or its cable.

I’ve attached a few photos here. https://imgur.com/a/GGnq5rq

As you can see the Mojave background is red and all wacky. Images of people look distorted and the screen looks foggy (not really visible in image)