Yes, that's exactly right, the Dewar joint was recessed, but that was not the problem, the joint itself was oval due to (my guess) too much heat when doing the weld.
Pictures won't really show much, but I shot a video and sent it to Yingmin, on the video I was blowing into the mouthpiece while holding the bowl in the joint and dish soap around it, and you could see bubbles all around, every time I blew on it. It was a bad seal, and as far as I'm concerned I'm the only person who has received one with this particular problem, so I shouldn't be worried about it if I were you, my replacement was really well made and I can't believe the small amount of money I paid for such a great piece of glass.