We could have several things going on. Soil type, weather, and time of year in the photos represented.
@JungleShadows
Kevin can you take a look at the photos in the database. I know I got mine from you and you have seen mine in the bed over different seasons, so it should be correct.
I have never notice mine to have a green center or cabbage form to the center of the rosette.
Hen and Chicks (Sempervivum 'Dark Cloud')
