Jerry,
By "via the auto-enrol" do you mean you are using one of the auto enrol plugins such as https://moodle.org/plugins/enrol_autoenrol or https://moodle.org/plugins/enrol_auto ? If so, that would make sense.
When you create a new course shell, what enrolment methods are already included in it by default? Was this created from scratch or by copying a template course? Either way, I would look into the settings for the enrolment method that your first user used to get enrolled.
By "via the auto-enrol" do you mean you are using one of the auto enrol plugins such as https://moodle.org/plugins/enrol_autoenrol or https://moodle.org/plugins/enrol_auto ? If so, that would make sense.
When you create a new course shell, what enrolment methods are already included in it by default? Was this created from scratch or by copying a template course? Either way, I would look into the settings for the enrolment method that your first user used to get enrolled.