happens to me all the time, sometimes it's my fault, you see you think you have it dialed in but there are things that we dont always control, I pop my beans in the same cupboard and for some reason, like once out of 20, beans wont pop, might have to do with the timing, temps, I dont know what, but it happens with my beans, same batch of beans with get 10 out of 10 2 weeks later. Also, I always always have way better results with my seeds. When you order from a seedbank, especially an older variety, it is likely that the seeds are as old as the variety and if they were not stored properly at any point they might not be viable anymore. It's too easy to blame the breeder or the seedbank but know that the seedbanks are all trying to build reputation for selling legit seeds from actual breeders and if they start selling seeds that are not from the breeders they will go out of business really quickly........