One problem with manually turning a device off is that the “off” pattern that Sense is looking for may be different when the device is manually turned off vs. when its built-in control system turns it off. The device model is built with the assumption that the control system will be generating the off event. So, if you physically pull the plug on the fridge or turn off the circuit breaker, Sense may “miss” the off event and still display the device as running.
One way to get around this problem is to watch the realtime power meter as you turn the device off manually. If you see a drop in wattage in the power meter that exactly matches the running wattage of the device in question, you’ve probably got a match.
Another way, which is hit or miss, is to turn up the temperature setting on the fridge temporarily until it shuts off. That will likely cause the proper off event to be generated.