problem with modbus register

Why the sum of individual readings from the phase registers is not equal to the sum read from the sum register.

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Sorry, these two registers in the below pic are used to record the kWh in NEM mode (net energy metering mode now, not the sum of 3phase kWh anymore.

We upgrade the register definition since we began to support NEM.

When we support NEM, it needs two registers to record the kWh in NEM mode.
And we do not allocate new registers and use these two directly.
Because we thought using one register to record the sum result of 3phase`s result is no sense (You can read 3phase`s kWh and sum them manually).

Thank you for explaining the problem.

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