Let me help explain what 66% het means and it will make more sense.
Let's say you breed an Axanthic to a Normal. All babies will be Normal 100% het Axanthic.
Let's say you breed two of those together so Normal het Axanthic to Normal het Axanthic:
-25% Axanthic
-50% Normal het Axanthic
-25% Normal
but there is NO way to tell visually which are Normal and which are het, so you would call all of these (75% of the clutch) "66% het" because 1/3 of them will turn out to be plain old Normals without a het.
Once you breed the 66% het to an Axanthic, and it produces any Axanthic hatchings at all, it is "proven" to be 100% het Axanthic. However if you breed it and have a large enough pool of babies that none are ever Axanthic, then you would discover it's just a plain old Normal.
Hope that helps! Congrats on proving yours out!
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