ᐅ Black tire marks on driveway

Today I noticed something strange. We drove back about 400km (250 miles) from our vacation. The outside temperature was around 30°C (86°F). Afterwards, I parked on our newly paved driveway made of light brown Tegula stones. I noticed that there were black tire marks on the pavement. Is this normal? I was able to remove the marks with water and a scrubbing brush.

I also noticed this last year in our newly paved courtyard in light gray. However, it disappears whenever it rains, so it’s okay for me.

I can’t say if this is normal, but I assume it is.