So i've had these fella's for little over a week, changed container a couple of times but they've been in this casket for the past 3 days now and they just refuse to hatch? Aren't they supposed to change into moths after 16 hours?

I have no idea how to reproduce this, i can't reproduce it again myself, but somehow just these ones refuse to change that all came from the same batch. I have not had it happen again since.