Yeah when you see a description on a certain breed's egg color, no one tells you that the description is just in general...That's one thing I figured out after my girls started laying.
For example, an "olive egger" (hybrid) may lay brown eggs, and people can get very mad when they find out that the hatchery "tricked them" even though there's no telling about the bird's genetics..
Or a maran might lay lighter eggs than maybe desired...Etcetera etcetera.