When accessing a course in Moodle, students have access to hidden activities in the site. It appears that the way a user is added might be the culprit, although our testing on Moodlerooms hasn't shown anything in the code that should be allowing Conduit users to see these hidden activities.

Steps to replicate:
Create a new course
Add 8 activities: 4 visible and 4 hidden. These can be created in any order.
Enable Moodle Mobile for the site
Manually enrol a test student user
Access the course from an iPad or iPhone.
The user will not be able to see the hidden activities.
Enrol a test student user via self-enrolment
Access the course from an iPad or iPhone
The user will not be able to see the hidden activities.
Enrol a test student user via Conduit
Access the course from an iPad or iPhone
The user is able to see the hidden activities.

From our testing, the version of the app hasn't made any significant difference.