I have changed my hair color three different times using Self-Style Hair Kits and the color of the hair does not come out the same once the change is applied. The color has been darker every time I apply the change vs. the preview. As a last ditch effort, I tried a Total Makeover Kit to get the hair color that I wanted (the same as in the preview before accepting changes) but that did not make a difference, it still comes out darker. This is on a human with one of the Elonian hair styles.
I also had a guildy who just used a Total Makeover Kit on their toon and they had a similar experience, his was on a charr.
Is this a known bug?