I noticed this everytime I quinted a mutant that had the ability deja vu or hatch.
It seems like if you quint a creature that is a mutant with one of those 2 abilities, it acts just like a normal creature, when it should create another mutant creature, not a normal one.
Today I had a 5/5 Gargoyle with hatch (mutant), use quint on it, and then used it's ability. It should've turned into a random mutant, but it turned into a normal chrysoara exactly like this:
And yes, the ability was
:Poison and it has 0/2.
A mutant should have the ability's cost of it's element, in this case, either
or
and a random ability.