Hi,
Repeating data will not merge automatically. We need to select “merge” option while adding promoted properties. Please follow the below steps to select “merge” Option.
1. Click on “Add” button.
2. Select Field from repeating table.
3. Select “Merge” in the “Choose a Function to use on repeating dat” dropdown and Click on ok.
4. Now publish the form to share point and verify the repeating data in promoted column.
I hope this will help you.