perhaps the breeder had bred a spider to a black pastel and assumed all the offspring would be crosses. With spider being dominent and the black pastel being codom, the litter would be a mix of spiders, black pastels, i think some normals, and some black bees. I could be wrong and Im not sure on what the odds would be, Im thinking 25% of each. Im no good with the squares.
either way he could have made that mistake.