Solax Inverter calculated monthly consumption Electricity Grid Import way off up to 70% than the reality

[stepanv]

I just realized, while doing an electricity monthly consumption recap, that

Solax calculated monthly electricity grid import (denoted by sensor.solax_today_s_import_energy) is way off up to 70% less than the reality.

For example, the electricity provider billed me for 268 kWh for April 2024 however Solax Inverter thinks I consumed just 81 kWh.
The 81 kWh number is reported in HA through this integration, but I also see it in the "stock" Solax Cloud.

It almost looks like I'm consuming energy outside of Solax but that's impossible.
Suspiciously, these wrong statistics started when I started to use the homeassistant-solax-modbus integration in HA.

Any idea what might be wrong?

I guess, l'll have to try to switch off this integration for some time and see what effect it has.

Details:

• Inverter version: X3-Hybrid-G2
• using modbus over TCP from homeassistant-solax-modbus (no updates since August 2023)