The seeds were too fresh, they weren't ready to sprout and needed to cure first... If you crack the seeds that haven't sprouted, they should all pop.. Cheers!!
Hello Michel!
I hope you're doing well. There has been very little breaking of dormancy, and it is a bit surprising that only one out of ten has germinated; fortunately, I’m seeing a more balanced ratio among the other testers currently involved. Have you tried cracking the shells? Your seedling looks great. :)