Doesn’t export custom fields

Hi

I have set up a custom field using Checkout Field Editor for WooCommerce called billing_find_us that the users have to pick from the list where they heard about our product.
When I go to WooCommerce>Export Orders>Set up fields to export>Common>Add field>Meta key>Pick USER_billing_find_us, the column appears in the Excel file when I export but all the cells appear empty. The custom fields appear in the New Order emails and in the Orders page of WooCommerce but they dont appear when I export the orders. What can I do?

Thank you