Odd that our male butter has only produced babies with the butter gene?

I was wondering if its just REALLY good luck or are there some snakes with stronger genes that get passed down? We have a big male butter het hypo which we bred the last 2 years.

Last year he was bred to a normal het albino and the result was 6 eggs and 6 butters...

This year we bred him to a mojave so far who just had 6 eggs hatch and in that clutch 3 BELs and 3 butters..

That is 12/12 babies so far that this snake has fathered that has the butter gene in it.

Anyone else with co-dom odds like this on certain snakes they have?

amazing luck? it's possible.....no other logical explantion.
i've seen a spider male produce an all normal clutch, and all male to boot (small clutch though, only 3 eggs)...

I would keep track of it and hold onto him. Could be some weird genetic defect. So far he's very well for you haha!