Yep, this is all WWB. These rounds are after firing the first reloads. I was pretty careful to make sure I picked up only my own ammo, but I suppose I could have picked up an errant one. As for not noticing the flash hole - yeah, I just can't imagine missing it.
Nonetheless, I've got 200 or so more reloads ready to roll using the same source brass, so I'll keep an eye out.
Thanks for the tip on WWB being slightly thin. I'll keep that in mind.