Not sure. Some of the cameras have reported a voltage, some a 1 or 0 (good/low) which I convert to a %. 25% is the "low" state. There is a chance these report differently (reversed) from prior ones.
If you enable Trace logging it should capture the "raw" data so I can compare it and see if it can be accounted for. Any logs you can send me via a message (so all the info is not posted here).