As you will have noted, there are two schools of thought to prevent accidental double-charges or no-charges. Both are valid, although I go with the load-a-bunch-and-check-them-all-to-compare theory, using a strong light or a flashlight.
The most important thing is to work systematically. Whichever way you go, focus on the process. Do one thing, then do another, don't flop back and forth.
(My gut says no powder in that one. If it was contaminated propellant, you probably would've seen at least some unburned powder granuals and you didn't see that. If the primer was off, it's unlikely that you would've said that all the powder was burned. Eliminate those two and what's left? Not a certainty, but... As to the issue of lube, while oils and greases can degrade primers and propellants and while the need for lube with carbide dies is debatable, keep in mind that for a lot of rounds, lube is essential and we don't see a lot of duds due to it. Which leads back to the probability of a no-charge squib.)
I would go along with the point that you should right now be concerned that you may have double-charged one of the others. Weighing them would be a good idea - even the normal minor variations in case weight shouldn't be enough to hide a double-charge.
My call, anyway.
BTW, don't give up - it's all part of the learning curve. You walked away from this one with no missing body parts and no extra navels. A bit of irritation or embarrassment is small potatoes provided you learned something.