I'm sorry for digging up this old topic, but after searching for this issue, this was the only one I could find.
Same thing started happening to me as of today. I usually have a solid blue light setup when during gaming, one of my fans started showing red.
After swapping colors and testing, I couldn't find the issue. Reboot, reflashing of firmware, etc, nothing seemed to fix the color from being shown incorrect.
Then I saw on a secondary fan, that 1 LED of it was slightly flickering.
So I started thinking that it might be the cause. And behold, after testing, I found out that 1 LED from another fan, completely messed up the other fan in the loop that came after it.
As shown and described here:
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So I guess my only option is to take out that fan, send it back and get a replacement?