Those are seeds, You can either take them off the plant or let them go, If you do let them go it will slow the Bud Production, all the energy goes into Making those seeds mature so your buds will lose there ability to get nice big and tight. Not sure what caused it, whether it is a flower you had on a plant you didn't notice or just stress, either way it will harm the size of your crop,
If you had one Hermi in your grow find it asap.
So if you happen to find a flower, What I would suggest is to first Mist the flower with water then take a pair of tweezers and pull it off put it in a baggie and wash your hands real well, and check for more,
If you happen to want to take off the branches with the seeds, it may just be better off to clip the bud with the seeds and try not to harm the branch if it has other buds that haven't been contaminated leave them and check them periodically,
A little bit of pollen can go along way, the reason I say mist it is to make the pollen not viable so it can't contaminate her anymore.
Well hope you get it figured out and you can help you girls before it is too late.
Good Luck
