A few weeks ago, I started noticing that none of my friends on the friends list were green anymore, which was surprising, until I realized that I was still friends with some green and grey coders, but for some reason, they don't show up on the list anymore.

Has anyone else noticed this? Is there a reason for this change?

EDIT: Here are some pictures showing what I mean:

I'm friends with several coders who are green and grey:

Yet it seems that the friends list sorted by rating only shows coders with rating above 1500.