I just went back and re-read this part, then I looked them up on Ideal's website and read that description again:
https://www.idealpoultry.com/product/1502/106#
"Blue Quail Belgian d'Anver bantam chicks hatch in three different colors: black, dark gray and light gray."
Sounds like black/blue/splash distribution. So I think they did ship the right chicks, and these are just one thing that happens when breeding blue anything in chickens.
(If you breed two of the light ones to each other, you should get only light chicks. If you breed a light one to one with black in the pattern, you should get only ones with blue. Breeding two blues usually produces all three versions.)