Returned energy on heat pump

Hi,

I recently installed a Shelly 3em to measure my ground source heat pump, NIBE 1250 on three phases.

The strange thing is that I see returned energy according to Shelly, not only consumption.Screenshot_20210604-172609_Shelly.jpg. I have checked all wiring and directions and everything is fine. The values on each phase are from what I've seen, positive, e.g. buying energy.

See attached screenshot.

Thank you, I'll look into it. 👍

I can see from the csv file that when phase 2 is in idle without any load, it exports 0.01. As soon as there is load no export. I enclose the csv file if anyone cares to take a look.

Any help or suggestions highly appreciated!