SnakeAround
Formerly Blutengel
It sounds to me like the snow male is probably homo hypo.
One thing to remember about punnet square ratios - they are only a probability, and while the predicted outcome is the most frequent outcome, you still miss it more often than you hit it, and that is predictable.
I like math - so I'll do some crunches.
With the first pairing producing 12 young - the odds of 12 / 12 homo hypo offspring if your snake is het is 0.00024 (0.024 %). If the clutch was 10 and not 12, the odds of 10 / 10 homo if yours is het is 0.00098 (0.098%) which is still extremely low. So either your snake is homo, the female retained sperm, or the pairing was a fluke.
I would suspect your ghost motley isn't actually hypo (motley can have a hypo effect) - or if it is, it is a different hypo line than your snow male.
We can safely conclude the snow is not Ultra - and we can probably conclude the motley ghost is not Ultra (or else you would have gotten some ultramel this breeding) but it wouldn't surprise me if there are some hypo genes floating around that haven't been identified yet. There's also sunkissed and lava, though I believe sunkissed has a pattern modification as well? May be hard to see with the motley in the mix.
My suggestion would be to borrow a male standard hypo and breed it to the motley "ghost" to prove it one way or the other.
The odds of 12/12 het hypo would be the same...