Why are the South African birth records showing 2 images but 4 entries?

Each project has a preset number of entries. This project has entries preset at 4 per image. If there are less than four entries per images, you will click on the trash can icon on the toolbar.

This will bring up a dialog box.

If you have only two entries per image (4 total), choose "All blank entries" and click Delete. You will then be able to submit your batch.