So you've picked colors 1,2,3 and it's playing 2,3,1. Once the bars are going 1,2,3,1,2,3,1,2,3 looks the same as 2,3,1,2,3,1,2,3,1,2,3.
Remember that bars first fills the colors on the model solid and then starts the movement.
I would expand the strands and nodes to see exactly what color is starting first.
Here is what I noticed. If you pick RED, GREEN, BLUE with movement to the right on a model with 13 verticle lines, you'll get the R,BBBB,GGGG,RRRR and that is correct.
RRRR is on the far right, and the first color picked.
GGGG is next and is the second color picked
BBBB while it's the second color when viewing left to right, it's the 3rd color chosen.
R the repeating color is left over from RGB.