If this plant had a seed. It is either a female or a hermie which was pollinated by a male or a hermie. Either way (unless its a hermie), it won't cause your other girls to have seeds. Males/hermies produce pollen which travels to a female flower and makes seeds. Its unfortunate that you are getting seedage... but thats no reason to give up. Personally, I'd rather have buds with some seeds than NO bud at all. Try to find out where the pollen is coming from and put a stop to it. If you have a male plant, yank it. If you have a hermie, cut off the male flowers. If you don't have any males or hermies, then someone nearby is also growing and they must have a male or a hermie. The pollen from their plants are getting to yours.
