Several different color beans in seed package

[clkingtx]

I bought a package of romano bush beans(Ferry Morse), and was surprised to see that there are several different colors of beans in the package! I wonder why this is......... Is it a plant that makes several different colors of seeds, or (more likely) are there several different types of "romano" beans, and maybe this is a combo pack of several? I don't mind about them being different varieties, I just really prefer the broad beans instead of the skinny ones.