Who is guilty? May koi experts help me.

[hosseinfathali]

I have a butterfly female and a standard fin male, from which I spawn twice so far, both times with disastrous result. From 3000 fries only 400 were healthy, and the rest had some kinds of deformity. Considering parents are without deformity, can the catastrophic outcome be due to mating a butterfly and a standard koi? I'm really in a dire situation. I attached pictures of parents for your judgment. please help me with your insightful suggestions.