How did I get this olive colored egg?

[Snowy_Idaho]

I’m trying to better understand egg color genetics. I’ve checked out charts, but I could use some clarification.

I purchased eggs locally from a farm to incubate (they generally just sell their eggs for eating, it’s a mixed flock). The two hens from the batch began laying, and I have questions about how their egg color came to be, based on the roosters on site.

I was told the roosters were a Maran, and a Blue Sapphire Plymouth Rock.

Egg A: Hatched out of a blueish green egg
Egg B: Hatched out of a medium tone brown egg

Egg A chicken: Lays a light bluish green egg
Egg B chicken: Lays dark olive colored eggs

I would have thought that with the two roosters on site, the brown egg would have produced a hen that also lays brown eggs?

Can anyone clarify this for me?

Thanks in advance for helping me wrap my brain around this!!

 

[sourland]

There had to be a rooster in the flock carrying the blue egg gene. Beautiful birds in great condition.