Refoss EM06 power meter - how to accumulate energy month after month

Hello! I own a Refoss EM06 power meter, which provides me with the readings of electrical power (kW) consumption on 6 channels. Each channel also has an energy reading (kWh). However, this energy reading resets to zero every month, so I have no history of my energy consumption month after month. Therefore, the history looks like this, and my data is completely useless.

How can I workaround this problem?

Thank you!