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Both sets of parents have bone density in the upper reaches for warmbloods. I would say that they are close enough to maximum, that the built-in variability is what has pushed the foals into the draft category. You will notice that the dam of the second foal is the only one of the four parents with a bone density less than 2.2, which would help to explain why the foal's bone density is just into the draft range.

I think it works this way. Each parent always has a range of potential results for every characteristic. When the stallion and mare are bred, a random number from the bone density range for the stallion is added to a random number from the bone density range for the mare. The result is then divided by 2 (There may be an additional random factor involved, but I don't know for sure.). The result is the bone density assigned to the foal.