Welcome to the community, @AhmadSaudi! If you look at DATA>Table as shown in the image shared below:
you should see Validation status, _version_, _id, _uuid, _submission_time and _submitted_by. These are the additional information stored by the system to manage your submissions systematically.
For details, you could have a look at our post discussed previously:
Note: if you do not wish to see these while downloading your data, you could always filter the same during download as shown in the image shared below:
