My septum piercing smells REALLY bad

I got my septum pierced in October and it’s been fine since then, but last month i noticed that whenever i adjust the ring i smell rancid blue cheese. Lately though it’s been even worse, i don’t even have to adjust it to smell it. Its gotten to the point where i genuinely can’t tell if i myself smell bad, or if it’s just the piercing. I’ve cleaned the whole thing, and even soaked my nose in salt water. I’m planning on changing the jewelry out soon, but what has caused this and how can i prevent it from happening again?