Shelly 3EM 3-phases Energy sensor

Hey everyone.

I installed my shelly 3em and have a problem with one negative phase.
I double checked the clamps and the wires and phase three shows me a negative power consumption…

I live in Germany and I installed the shelly like this:



In Home Assistant I can see all sensors however the current consumption 3, so I’m guessing phase C is negative.

I tried just turning around the clamp on phase C however this led to incorrect readings as shelly 3em tells me I have used 1500 kWh in the last two days which definitely can’t be true.

What can I do?