The percentage breakdown you showed is not accurate for this pairing. It would be if lemonback and vanilla are on seperate loci, but they are not. Most if not all morph calculators are not sophisticated enough to adjust their formula for compatible co-dominant genes.
Real breakdown:
25% pastel lemonback
25% pastel vanilla
25% pastel lemonback spider
25% pastel vanilla spider
As you see, no cremes.
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