If your Subpod smells, it indicates that food is rotting before the worms can eat it or there is not enough oxygen in the system.
In most cases, adding more carbon should balance your Subpod out
Add carbon sources such as shredded newspaper or cardboard, coconut peat, wood shavings, dry leaves or sawdust each time you feed your Subpod, along with a handful of biochar.
Have you been using your aerator? Each time you add your food waste make sure you use the compost aerator to mix the scaps thoroughly whilst also adding oxygen to the Subpod, which creates a healthy, fresh-smelling aerobic environment.