It depends what you’re looking at … hence the unintuitive aspect.
If you are viewing the overall Power Meter view for your whole panel then yes, indeed, you would (should) see power drop by 108w if the device (fridge) was on at the time. As the fridge was on, which you can recognize I assume because it’s compressor would be making noise then in pulling the power and seeing the 108w drop you would guess it’s using 108w. Good.
If however, as seems to be the case from your screengrab, you were viewing the Device-only power meter there is no guarantee that that interpolated (by Sense ML/AI) waveform will “switch off” (go to zero) when you unplug the device. The easiest way to think about this is to imagine you had, say, 3 fridges but Sense had only ID’d one of them. What would you expect to happen to the Device waveform in that case as you go around unplugging fridges? The device waveform is rendered from “realtime” power use, sure, but the decision that that part of the waveform (the device) is a device is based on a machine-learned decision – that could be wrong.
There are probably more elegant descriptions of this elsewhere.