CFP - You did make a mistake with your rotation. The center squares should be in the same position as the larger outer squares. You only move the two piece strips (blue/white; pink/black; white/pink; black/blue)
I find it helpful to:
1) keep the pieces laid out as the whole block
2) sew all of the same set at once
3) press each set and put it back in the block layout before moving on to the next set
I hope this helps