I think this has to do with the way the data is associated, example: one to many or many to one.
In this case for the pie charts you are coloring slices that belong to multiple regions (terror code). Hence it becomes light gray. If each slice only belonged to one you would get colors on each slide.
Try this: Take one of the pie charts and copy it. Then convert it to a table and then add [Terrory Code] as a new column. You will see which slices has multiple values.
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