In your blues the 4th from the left seems to be marginally darker than the 2nd and 3rd from the left, or is that just a shadow in the picture? Anyway, the 2nd, 3rd and 4th look to be almost identical in value in this picture as do the first 3 in the greens.
When you show them in the color picture the differentiation is noticeable but not in the black and white pictures.