Shading with 2 same color in the palette

I was wanting to do shading with the 4 last color of my palette but it was not working.

Took me some time but now I am sure this is because i have 2 time the same color in my palette this is working if i do it with the first color occurence in the palette but not the 2nd, if i dellete the first one, the seconde is now working.

ps: sorry for my bad english.

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