Inverted Colors Fix!!
So - for the life of me I could not figure this out. But my iPhone X color scheme became inverted while the phone was in my pocket.
To fix, most people are saying to access the invert color options via General/Accessibility/Display Accommodations but those options were set to normal for me.
BUT if you look at Zoom/Zoom Filter under accessibility you may see that the the filter was accidentally set to INVERTED or one of the other options. Simply set it back to none and that may solve the problem.
My guess is that the zoom options popped up when the phone was in my pocket and pressure may have set the zoom filter to inverted.
Anyway, hope this helps others.
iPhone X