Active power is larger than apparent power on ADE7880?

Hi All,

I was using ADE7880 recently and I have a problem.

When I start a device, the active power will rise up to a certain value within 1 or 2 seconds.

Just during this time period, I find that the active power is larger than the apparent power.

And at the same time, the reactive power is reduced to 0, and power factor is 1.

Could anyone help me to figure out the problem?

Best Regards,