The yellow chick with the gray area will be your Lav mottle chick. In my opinion they turn out just as pretty. Heres a pic of my mottle.
Shes a Sept. Hatch. Gets prettier everyday.
I have Lav Orps and bought from a trusted breeder/projector. If you could post some pics of your chicks maybe we can get you a better understanding of what you really have. IMHO if you are paying for something you should do some extensive research IMHO I have been burned in the past and learned...