why are my two layers linked? I don't know what to select to unlink them.
I have a bottom layer that are grids.
Next layer is my artwork.
To the layer above that I drew a large rectangle and put in a color gradient fill, then adjusted the opacity.
As usual, I then select the little plus sign in the bottom right hand corner of the Layer Panel to make a new layer and draw another rectangle with a different fill, but then the fill below changes to match what I'm choosing for the upper layer. In otherwords, the two layers are linked. I've deleted them both but when I remake them, they are still linked. If I draw on the upper, it appears on the lower. This hasn't happened before and I'm not sure what setting I need to adjust to fix this behavior. Any ideas?