Hey brotha, stumbled on this. What you probably have here, I believe has almost or more or less been mentioned. But it's basically due to high moisture in the flower when the seeds were in the flower. Basically if you'd have left them much longer in that situation you'd have probably seen some germinating. It happens and it's a bummer. I had to ditch 2-3k seeds for a similar situation the other day. Humidity was not an issue in my grow either. There are other reasons or ways this can happen too, but from the little I picked up I don't think they're the cause. I think Frim mentioned it about drying. Some seeds have very thin husks or outter shells, and if dried quickly have a tendency to split open. You'll see it a lot in under developed seeds if you dry with a desiccant or something or extremely dry conditions(think winter time heaters been on and stupid dry air). My guess is the flower moisture, frustrating I know. I didn't leave mine in there to ripen for too long or anything either. But if you don't mind me asking, for my own knowledge and problem solving, are those what you'd consider "smaller" seeds than normal or about normal sized? I ask because the two different times I've seen this happen "naturally" they were both what I'd call "smaller" seeds. I feel like it translates to possibly a thinner husk/outer shell. Anyway, that got long quick, weird not like me at all hahaha. Hope that helps my friend. As far as a fix for that, I've not found one other than run it again and wait a couple more days longer to pollinate. Thought there is if they're (the seeds) are closer to outside of the flower, they won't retain the moisture like the more inner flower sites. As always my friend I wish you the absolute best, let me know if I can be of any more help.
