Quite likely … that Sense has found components and not the whole Fridge.
“Unfortunately” (for everybody) this is the downside of the Smart Plugs: they track the whole fridge perfectly but you don’t have the “advantage” of Sense seeing and logging the separate components as separate Devices.
@samwooly1 I believe is clocking the number of times his fridge door is opened, for example, because Sense sees that as a separate device!
Eventually we may have the best of both worlds.