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You have 3 grayscale layers (R=G=B). You have to reduce them to their color component (R, G=0,B=0), (R=0,G,B=0),(R=0,G=0,B). You can do this for each layer with Color>Components>Channel Mixer, in which you will for instance set the Red layer to 100% of its red component and 0% of the two others. When this is done your layers should be black and red, black ...

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