I think you've found part of the bug, if not the bug. See, what's odd about this is that for me it's related to "This Window Only" being set. Secondly, it will flip back and forth between two colors -- usually the two reversed colors -- ONLY when the View Options inspector window is shown. Otherwise it stays at one or the other.
And when I manually set "This Window Only"'s color, it usually reverts to some other color. It seems that if I manually set the window's color and keep the "This Window Only" it jumps to some arbitrary color, but if I haven't set a color in there, and it's pulling from the iMac, it reverses the R and G of what it's supposed to be.
Here's a video demonstrating this (I'd recommend an opt-click and "Download Linked File" as it is a 1280x800 res movie). The windows jump around rather quickly and the video is highly compressed as I wanted to keep file sizes down. Mainly all that you should see here is that when the inspector window is open, the colors flip. When the inspector window isn't open, it maintains the previous color. When a color isn't set in "This Windows Only" (pulling from the network share .ds_store) it flips the R and G. When a color is manually set, then, it flips between two arbitrary colors. (I just noticed that the crayon picker was on my secondary display in this video, but this is set near the end of the video).
I am inclined to believe you oughta write up a bug report and file it to https://bugreport.apple.com
Holy crap! That’s the exact same thing happen on my Mac Pro. The funny thing is, it only happen if you set it to "This Windows Only" It work normal with "All Windows" setting. And if you have the "View Option" window open, while closing the folder it switch the color back and fourth. It switches to the wrong color, then back to the right color again. Opening it without the View Option window open will result in the wrong color and doesn't switch back to the right color.
That's a great video btw, maybe you should send it to Apple to have them fix the bugs.