If you have 2 100% hets then you have a 1:4 chance per EGG to get an albino. If you have 4 eggs and hit the odds dead on you'll get 1 albino, 1 normal, and 2 hets that look normal. Since you can't tell which is which, you'll have 1 albino and 3 66% het albino's.

The percentage is the liklihood that the animal is het, not how het it is. Het is a yes/no thing, not a percentage.