by Aaron Barnes.
Claire, Kalthoum Rezgui,
It appears that when MDL-32107 was fixed for Moodle 2.3 completion changed to track all users enrolled in a course, rather than just user's who had a tracked role in the course (which was normally just the learner role).
This now causes the Course Completion Status and Self Completion blocks to display tracking details when teachers are logged in.
MDL-34228 introduced a new capability isincompletionreports for enabling/disabling this for roles/users, and the blocks need to be modified to respect this e.g. only dislaying tracking information if the logged in user does has this capability.
I have created the bug MDL-37473 to track fixing this.
Hope this helps,
Aaron