I'd have to have more detail about the seeds. Are they organic? raw? are they salted? do they have any other ingredients but organic raw sunflower seeds?
You have to be careful when buying seeds, especially sunflower, because they tend to get rancid very easily. The way tell if there rancid is if it has a strong, sort of astringent smell, or if you get a little 'bite' so to speak on the back of you throat after eating them.