Self-consumption on Multi-RS system not working properly

Yesterday evening, I installed firmware 1.31 on my Multi-RSs (3 phase system). Today I noticed that on L2 and L3 the PV surplus is sent to the grid instead of sending it to the battery when in self-consumption mode. On L1 this seems to work okay (see picture).

First I thought it was a DESS related issue, but when I disable DESS I get the same behavior. The screenshot was taken while DESS was diabled.

Some backgound info:

  • Cerbo GX running on 3.75
  • The Multi-RS inverters synchronize their settings
  • 2 PV inverters. One is a 3-phase inverter; one is a 1-phase inverter on L3. Both are measured using CG EM24 energy meter.
  • Main grid meter is a VM-3P75CT

Any clue why this is happening?