Hi @4626060,
This is actually expected, as it’s how light behaves in the real world.
This is your bounce lighting. The light is hitting the white floor, reflecting off of the car, and bouncing back onto the shadow. The areas with the blue shadows are doing the same thing, but their bounce light has been colorized by the blue paint of the car.
Here is this effect shown in a few photographs:
If you are still looking for a way around this, I would suggest darkening the area under the car further and increasing it’s roughness value. Since this is an expected effect, the way to adjust it will be through adjusting the materials in a way that naturally decreases their reflectiveness.