This the original post and afterward we find out the culprit is the Flashback Data Archive (FDA).
It is a simple fix. We just need to bounce the FDA and within a few hours, oracle should release all the spaces.
BEGIN
dbms_flashback_archive.disable_application(application_name =>'PARIS_AUDIT');
dbms_flashback_archive.enable_application(application_name =>'PARIS_AUDIT');END;/