I’d post this bug in the actual Energy topic, Jari:
https://community.homey.app/t/homey-energy-public-beta-megathread/123457/
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Please check insights for “Energy” if there is one or more peaks.
Deleting the previous consumption of 65 kWh makes a new consumption of e.g. 0.5 kWh visible, which would not be the case if the previous comsumption would still be there (the difference between 0 and 0.5kWh is probably very visible, wheareas the difference between 65 and 65.5 kWh is likely not visible).
This way, we would have more visible information than a flat 65kWh line…
I don’t understand what you mean exactly, sorry.
It’s not about resetting the consumption, the question is why does the consumption of a 10 W lamp suddenly increase from approx. 2 to 65 kWh?
Are the values supplied by the Fibaro Double Switch 2 incorrect, or is it something wrong with Homey?
It is my assumption that the device had previous energy consumption recorded and the 65kWh was the first time it reported its energy to Homey.
To ensure that this scenario did not mess up any reading, a reset of consumption would be a good starting point for further investigation.
Having said that, it does not solve anything indeed, but it can remove any noise (yes I consider the 65kWh reading noise) from the measurements and get a solid baseline instead of one that we might not be able to trust.
Starting from 0 it is also easier to see which power consumption lead to which energy usage, starting with an energy reading “0”.
So, resetting the consumption makes any historic data as well as historic noise obsolete, and we get a chance to take clean readings (and potentially errors in energy).
I don’t have answers, but I do have a proposal for a strategy for getting answers. No more, no less.
What I CAN see is that in the initial two screenshots, the 2x the switch activated, DID NOT cause the 65kWh consumption, simply from the fact that the time of the 65kWh consumption does not coincide with the 2x the device was used.
Except for the first sentence, which is only a guess on your part and one which I do not believe, I agree with you.
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In this thread more time is consumed discussing causes then doing tests which lead to getting clear results, better insights and discussions and excluding possible causes. 
That is what fault analysis is all about: postulating causes and trying to falsify them until the real cause is found. Unfortunately only until you solve the real cause of the problem, you have proved that you found the problem.
