Urethane waves or wrong sanding grit ?

Hi,

I was testing some finishes on a spare motorcycle fender I have. After the clear was cured I try starting to block sand at 1500 and finishing with 3000, and after I polished the fender I noticed the reflection weren't straight, I basically had visual orange peel so, my question is, did I do wrong by not starting coarser like 800 or 1000 or did apply too much clear resulting having urethane waves ?

I did 3 medium wet coats