this is a fairly bad grow....too much stretching ( low light? ).....you trimmed way too much ( or they died off )....you over trained the plant ( and you broke it looks like from the tape or whatever around the branch )
you would have had better results just letting one of those plants grow naturally by itself
all that stress may have created a pollen sack you couldn't see
or, sometimes females randomly will make seeds, and they'll be feminized