Heredity past the limit

I just combined two creatures a heredity of -16 in one trait. You might want to double-check how you’re limiting the stats.

Parent 1:
Health +10
Attack -12
Intel +9, (I think)
Defense +7, (I think)
Speed -13

Parent 2:
Health +1
Attack -4
Intel +4
Defense +4
Speed -5

Result:
Health +10
Attack -16
Intel +12
Defense +9
Speed -15

On a somewhat related note, I can’t find a single creature with high health and low attack, leading me to believe that there is no creature with Priming +Health -Attack. Is this actually the case?