what I say is you were very lucky. This is the type of result I often get with the same scenario
fur: genesis
eyes: genesis
big/curious
tail: posh
ears: genesis
whiskers: silver/guitar
I often get 1, 2 or 3 hidden traits but that's it. It is very very very lucky to get 8 hidden traits even if the partner traits are very recessive because genesis is extremely dominant and you have a 50% chance of getting genesis on each trait. Getting 8 hidden traits like that is like flipping a coin and getting tails 8 times in a row. Of course people do get a boy kitten 10 times in a row. It is just that particular flip of the coin.
Sometimes though, the impossible happens:
Mom has mysterious whiskers
Mom's parents has mysterious whiskers
Mom's grandparents has mysterious whiskers
Mysterious is very dominant
Mom has baby with wavy whiskers.
And that my dear is why people play the slot machines and win a million. The odds are a million to one but you can't win if you don't play. It's also why I like mixing and matching my kittens because there are always surprises