The more I look at the picture, I realize that the rings being stacked or not is a direct result of the knot that is tied. Hear me out.
A "knot" does not allow the loop of cord that the rings are in to tighten around the rings, keeping them in place. The ring that has the webbing fully around it has rearward pressure that pushes it back into the extra room that is left by the knot.
A hitch, on the other hand (lark's head, prusik) will tighten on the rings when it's weighted thus leaving no room for the ring to slide back.
* this setup may work for you, hooch, but this is the reason my wife's hammock slipped this weekend. I did not realize the problem until just now. I left the knot that was tied around the S-hook on her SBPro and just put rings in it's place. I thought it was because the webbing was slicker than mine, but no, I used the same webbing on my friends HH. The only difference was that hers had a knot and his had a hitch. We tied a safety behind the rings anyway so it wasn't a big issue, but this is the problem. I'll have to fix that when I get home tonight. Thanks for helping me discover this problem. USE HITCHES