The profile you are referring to belongs to Cyrus.
If Cyrus posts in boards moderated by him (Marketplace, trading discussion, Română (Romanian) and Other languages/locations), the last coin is displayed in red.
If Cyrus posts in any other board, the last coin is displayed in faded-out green.
As I suspected. Yes you are right, the profile belongs to Cyrus. I have tried opening threads where he is the moderator and see if it is red or not. It seems that I am right what I think the reason why it change when posting in a thread where you did not moderated but not sure enough if my suspicions about the shiny coins changes. It seems that an admin that is also a moderator of a board or section would also show faded-out green in the last coin. My thought is that moderator's last shiny coin would always be in red since I always saw theymos' shiny coin always in red and Cyrus is an admin + mod or I call it Admod.
Thanks but I already know about it. It's just the same profile where faded-out green or red will be seen depends on boards where a post is posted.
I think the effect of that two color of half coins under his/her name is base on the position of that user.
More like an ID of your position. I am aware of it. As you can see in this post, I mentioned about a profile where the shiny coin will show either red or faded-out green as explained by hosseinimr93. As you can see, each rank have coins like mine where I have 4 coins.