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If I go to the fill tool, use the eyedropper to select a color in the image and then fill the background, the background color is actually a different shade than what I picked up. Even the HEX code changes. The same thing happens when choosing the fill color of a rectangle. I paste in the correct HEX code and the color fills, but when I then use the eyedropper on the newly filled square, it shows the color is actually different.
The only solution I found is to select the background layer, activate the style tool, check "Fill" and then use the eyedropper. It only works in that case.