I have the same issue with some Heatit ZM Single Relay that control the lights. They report some crazy high energy usage, and it seems to be because the relay sometimes reports an erroneous energy value (effect or watt is correct). It corrects itself on the next reading, but the consumption adds up in the energy tab.
I talked with the producer and they say it is a known problem with the SDK and not possible to fix without replacing the unit. Can you make some error correction in the software for this problem @Emile?
I have added screenshots below of the energy tab and the accumulated energy consumption of one of the relays.
