6ch Energy Meter: Some power reportings are negative

Hey there,

I've successfully installed the 6ch energy meter, but I'm a little bit baffled why some Power reportings are negative, but the actual consumption / current is actually correct / positive... I 100% made sure the clamps are the right way around, I triple checked them: The energy flows in the arrow direction.

Here's a screen of the Web Interface:

And here are photos of the wirings:

The reference voltage / the device is powered from phase 1, if that makes a difference.

Thanks for the help and greetings,

Andy!