Not a scam, but a confusing morph mix-up when first discovered. There were two different snakes that both looked "woma". But the two different womas were throwing different-looking babies. One woma's babies had the reduced pattern characteristic that would be expected, but the other woma was throwing some crazy stuff. So that second woma was believed to be carrying a "hidden gene" that was becoming visible when mixed into combos.
After more breeding, it turns out to be a single gene that is different from the other, "plain" woma gene...but the name "hidden gene woma" stuck.