I see a difference in energy data that gets exported to csv when using different time ranges for data like calculated_grid_to_battery.
E.g. here is a export from a single day:
And here a export for the same month:
So in time ranges like week/month or > 3 days data for grid_to_battery/battery_to_grid is missing/turncated.
This can also be seen in the energy flow chart.
This could be some rounding issue but should not happen.