LED notification color changes

[acn]

I noticed that on my hongmi wcdma (stable 13) LED notification acts a little weird. Sometimes it just goes through a couple of colors in one cycle. For example, I set up blue color for messages and it works ok most of the time, but sometimes it goes cyan-green-blue in one cycle and there was only one unread message. There are also other combinations.
Is this a bug?

 

[Carl vO]

Happens to me as well. Doesn't bother me but it's strange....