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There are a number of Wyandottes out there that either have single combs or that carry the recessive gene for single comb, but have rose comb themselves. Sounds like you got hatchery stock Wyandottes, they tend to yield a higher number of single combed offspring and deviate from the APA standard otherwise in color and body shape. They will tend to be leaner than a show quality bird, and lack the roundness that is desired. They can also have very different pattern from what they should, from being almost all black to speckled white.
As for rose comb/single comb there are discussions as some people insist single combs in the gene pool increases fertility. I have not had any single combs pop up in my stock, nor do I intend to introduce any. I've incubated several clutches of eggs using 3 different roos, all eggs candled and fertile. Some folks even argue that a Wyandotte with single comb is not a Wyandotte, as it does not meet the standard.
Obtaining and maintaining "perfect" coloring in a laced bird is a lot of work, even starting with top breeder birds. At hatcheries they breed for quantity rather than quality, which will result in a lot of deviation from the standard, as the hard work of culling that the top breeders do is left out of their breeding programme. If you want to compare check out mrs turbo's or katy's birds in the official wyandotte thread! They're gorgeous!
Please note that these comments are in relation to the STANDARD, I'm not trying to demean your birds in any way. It's just the way it usually is; people want to try wyandottes, then order hatchery birds and are disappointed with how they look... Hatchery or breeder birds is a choice of preference, personally I prefer breeder birds for looks, and though mine are breeder stock, they are not nearly as nice as Katy's and mrs turbo's.
Oh, and another thing I've noticed with mine is the roos tend to be whiter across their shoulders than the pullets from early on.