Hey bro! There could be several explanations or reasons for this. First of all, you might have accidentally pollinated the plant yourself by bringing pollen on your clothes, or the wind and a nearby male plant could have pulled off such a surprise, but that would most likely happen around half of the harvest. If you have one seed in each bud, then you can judge the instability of the phenotype you are considering. For example, the AK-47 phenotype is unstable and can produce seeds in its buds. It happens, bro! 👌😇👍 Good luck! 👋