The common thread is pressure imbalance. In a sealed pod, liquid sits in a chamber with a tiny air inlet. When that chamber gets overfilled, heated, or the seal loses its ability to hold a stable vacuum, the pressure equalizes by pushing liquid out the path of least resistance—usually the coil and airflow hole.

Think of it like a straw with your finger over the top. If the seal is perfect and the temperature is steady, the liquid stays. Crack the seal or change the temperature, and the column drops. Same physics, smaller scale.

That's why the fix isn't about buying a new device or switching coils more often. It's about controlling the pressure inside the pod on purpose.