That what a hermaphrodite will do, buds and ballz!
You will need to clean your grow tent/areas good to get rid of any pollen so you don't carry these genes to your next grow. Make certain that something in your environment is not causing this, huge temperature differences, light leaks, inconsistent light schedule....ect ect
I'm not saying chop it down, you have quite a bit of time in these eBay seeds and do have buds. You could try plucking any balls you find to get farther down the road, it is a daunting task and you will most likely find seeds anyhow that you should throw out and not save.
You will have to weigh the checks and balances of trying to finish this grow or just cutting them down, smoke what it is and getting onto some better genetics, are you going to get a decent amount of smoke from your remaining plants?
Sorry purpleman if it make it better, we all have had seeds/ hermies before and most likely will in the future.