Your ladies had to get pollen from somewhere,

Do you ventillate with outside air? if so you could of got it naturally.

Did you pull the males out of your grow room early enough? what did you do with them?

The only other way is a hermi. Look very carfully all it takes is one ball

Thats all I can think of,

Still with the seed I bet it was better than most everything you can buy on the street. Plus you grew it, so be proud and enjoy.

excellent looking plants great job. Let us know your finnal yeild weight.