Absolutely NOT. Sometimes the poor quality of hatchery chicks will have single comb but it is extremely undesirable and can not be shown.
Hope you don't have any!!!
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It is most likely, as a lot of Silkies are - Of hatchery stock. It goes the same with Wyandottes - They should NOT have single combs, but hatcheries often have ones with single combs, some people say it is to boost fertility or something.