Multiplus is charging from Grid

Hello,
My newly installed Mp2 system works perfectly in Grid parallel configuration but as soon as the battery soc gets to 10% the mp2s start charging from the grid to 13% and then regulate the discharge to not feed anything into the grid until the soc gets to 10% again and the cycle starts all over again.
Has anyone an idea on what the reason behind that is?
Thank you very much,
Julian



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