Understanding Interaction Between Color Correction Groups
Understanding how the color correction groups work together is important. Adjustments made in each group are applied cumulatively to the current segment and its related material. If you make an adjustment in one group and then go on to make another adjustment in a different group, the image will show the cumulative effect of both adjustments.
This behavior provides you with a great deal of flexibility. For example, if you are unhappy with some of your adjustments, you can disable the group that contains those adjustments or reset its controls to default settings without disrupting other adjustments.
For more information on enabling, disabling, and resetting the groups, see Working with the Enable Buttons.
  If you make adjustments in both groups, keep in mind how the cumulative adjustments will affect the final image. Adjustments might accumulate, or cancel each other out, in ways that you do not want. Keep each stage of your correction distinct, and do not duplicate the same adjustment in both groups.
See Also
Understanding Color Correction Groups

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