Pins falling apart :(

Print was darker then its counter part sticker with the same image, which is unexpected but could be my fault. Several pin backs have fallen off in shipping/ in the bag they came in. I am worried that more will do the same. I planned on selling these I don't want to sell faulty products. I am going to use some e6000 to reattach the ones that have fallen apart and to re-enforce those that haven't yet.