Duplicate tracking of ecommerce orders


We have issues, that several Orders are tracked twice. It happens, when users are visiting the checkout success page again. We are using an unique orderId. You documentation is saing, that the old order will be dropped, when its tracked again: Ecommerce Analytics User Guide - Analytics Platform - Matomo

Could it be possible, that this is not working, when we have enabled DSVGO/GDPR related options like anonymizing orders number?


Matomo-Version: 3.8.1
MySQL-Version: 5.5.60-MariaDB
PHP-Version: 7.1.26