Stacking Order

When you have more than one Adjustment Layer affecting your image, the stacking order of the layers will determine the order in which the adjustments are applied. Adjustment Layers are applied from bottom to top with the bottom-most adjustment considered to be the first one that's applied. You should always have the top-most Adjustment Layer active when creating a new Adjustment Layer because new Adjustment Layers are always added directly above whichever layer is active. Try to maintain the stacking order that you started with, always adding new adjustments to the top of the stack because adding an Adjustment Layer in between two others, or changing the stacking order of the layers, will cause unpredictable changes to the overall look of your image.