Could this be the answer? Maybe the pressure is on the second round and not on the bottom round 🤔 https://i.nostr.build/t7gXs47ky3gYCLyj.jpg
I think that's it!! I just checked one in my go bag that was doing it and it appears to be coming from the very bottom, supporting your theory! Totally makes sense and resolves a riddle that I've been confounded by for almost 15 years!