Hatched a black chick when neither of the parents are???

[AtlantisPeeps]

So this chick hatched today. The mother is a lavender Orpington, Diva(I saw it come out of her rear so I'm 100% sure) and the father is a red sex link (I'm also 100% sure because he's my only rooster). It came out dark grey or black??????? With a white underbelly and white wing tip????? I hatched two other eggs from Diva and the babies are almost white with a few black dots. I don't understand? Can someone enlighten me?

Here's the chick in question-

Here's one of the siblings (same parents, and the third sibling looks like this one as well. White-ish with 3 black dots on the back and head)

 

[Ravynscroft]

Lavender is a recessive gene of black, and usually breeding it to other colors results in black offspring, hence your black chick... red sexlinks are created using a white/silver parent and a red/gold parent so he would be carrying white, hence your mostly white chicks...