I'm going out on a limb and guessing that if you look around line 156 - 182, you might need to comment out a few lines per the first comment line in that grouping. I'll dig a bit more to see what I changed or switched on/off.
Admin\includes\languages\english\orders_export.php
Code:
//list of fields to not duplicate in multiple rows of an order
define('OEX_BASE_ORDER_FIELDS', serialize(array(
'v_date_purchased',
'v_orders_status_name',
//'v_orders_id',
//'v_customers_id',
//'v_customers_name',
'v_customers_company',
'v_customers_street_address',
'v_customers_suburb',
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