Exactly why there is chance of it.
If you breed a super pastel to a pastel you should have Pastel and Super Pastel.
From that cross he should have Bee and Lesser Bee. and no Lucy
If you used this as the genotype (as I believe you did)
Killerbee : PPSn
pastel/lesser : PnLn
IT'S WRONG ! the Spider and lesser are not on the same allele
The genotype should be :
Killerbee : PPnSnn
Pastel/Lesser : PnnnLn
RESULT :Code:PPnSnn x PnnnLn Pnn Pnn PSn PSn Pnn Pnn PSn PSn PnL PPnnLn PPnnLn PPSnLn PPSnLn PPnnLn PPnnLn PPSnLn PPSnLn Pnn PPnnnn PPnnnn PPSnnn PPSnnn PPnnnn PPnnnn PPSnnn PPSnnn PnL PPnnLn PPnnLn PPSnLn PPSnLn PPnnLn PPnnLn PPSnLn PPSnLn Pnn PPnnnn PPnnnn PPSnnn PPSnnn PPnnnn PPnnnn PPSnnn PPSnnn nnL PnnnLn PnnnLn PnSnLn PnSnLn PnnnLn PnnnLn PnSnLn PnSnLn nnn Pnnnnn Pnnnnn PnSnnn PnSnnn Pnnnnn Pnnnnn PnSnnn PnSnnn nnL PnnnLn PnnnLn PnSnLn PnSnLn PnnnLn PnnnLn PnSnLn PnSnLn nnn Pnnnnn Pnnnnn PnSnnn PnSnnn Pnnnnn Pnnnnn PnSnnn PnSnnn