Shelly Pro 3EM Einspeisung Issue

Hello everyone, I’m new here and have recently discovered that my Shelly Pro 3EM is adding the feed-in from my rooftop solar system to the consumption on the phase. At first, I thought it might be a sensor installation error and reversed the measurement direction for the phase. However, the values still didn’t seem logical. I can read the yield from my rooftop solar system in my Fritz!Smart Energy 210 plug. I’ve just connected a new storage unit (Marstek Venus E 5kWh). When I set the mode to self-consumption, the Marstek charges directly up to 800 Watts. However, the Shelly shows the feed-in as consumption (positive). The electrician installed the Shelly in October 2024. Does anyone have an explanation for this behavior of my Shelly? Are the sensors installed at the wrong positions? The battery is connected to phase B. Below are screenshots with and without 100W feed-in from the battery. Thank you, Fred