astralhpi Spine editor's FFD Weight setting panel has only 7 colors. Therefore, we have issues with repeating bone colors when there are more than 7 bones.
Søren I'm doubling the list of colors, but I can't do the build so it will be about a week before it will be in. For now if you don't need a specific order you can drag the bones in the Weights editor up/down to get a different ordering of the colors.