I just hatched purebred mystic onyx chicks, or Atleast I thought I did. I separated my purebred mystic onyx hens and mystic onyx rooster and collected their eggs. 2 of the eggs just hatched, and one of the chick has white on it. Is this common? Or somehow did I mix up the eggs? The other tan colored laying hens I have are Rhode Island Red and ISA brown.