Grid import does sometimes not work

I have a Homey Pro with the energy dongle.
My SMA solar converter is connected to the Homey pro.

In the energy tab I sometime see the grid imported not working. The calculation is wrong. I only see the solar power produced.

In the graphics below I see the blue line of the power used from the grid. So it does work.

Some days I do see the grid import counter. Sometime it does not work.

Has someone a idee what the problem could be?

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