Why Do Some Car Headlights Split to Appear Blue?

I have a fairly strong nearsighted glasses prescription. While watching cars approach at intersections, with headlights on, a few cars seem to have a separate blue headlight, but then it's clear the light seems to split like a prism, white and blue, when the car is at a distance. Only a few cars have that appearance through my glasses, most just look like a normal white headlight. What's going on ?

I also noticed that when I pass a police car at its morning intersection duty, the red and blue light bars on the roof are not lined up. My glasses distort the blue light making it look higher or lower than the red light.