Yes this is good. You should contact the app developer. By default PBTH uses meter_power for kWh. And the app has that, but is set to null. So something is wrong there.
Secondly I see that measure_power is the apparent power, not the real power. That could explain the difference that you see when using Watts as source. Also that is something you could take up with the app developer. I would say it makes more sense to fill measure_power with the real power usage, not the apparent power.
