http://www.haicontrast.com/swap/swapproblem.html

http://www.haicontrast.com/swap/swapproblem.zip

Move over those colors and notice this: mouse over red, fine. mouse over
blue, red disappears under grey, whereas the red should stay above the grey.
when you get to the green, both red and blue are under grey. so what's wrong?
in my mind, each color should simply move to the top while everything else
remains unchanged.

anybody?

You never instantiated x.

To remedy, create a new layer and add: