When on timed export my house pulls from the Grid not the battery

Hi all, I have just had a system installed and thought all was going well… Until the last few days.

I have my battery set to export at 4pm to 6pm with a min level of 50%. If my battery is below 50% during the expert times the house pulls from the grid and it looks like my battery pauses everything. If I adjust the export time to a past time in the day, the house starts running off the battery and sola again.

Ive noticed this only happens if the battery is below 50% at the export time. What am i doing wrong?!