This is a strange one to me and first time I've seen or heard of it. I created all of the courses for my school last year using a csv upload. In that file I had default enrolment durations for different enrolment methods including manual and self. These were set to either 184 or 92 days depending on the actual duration of the course. We enrolled students, again using a csv upload, and it all seemed to work without an issue.
Now I am seeing the enrolment durations for these methods has changed to 3 seconds in many, if not all, courses. I don't know how. I have tried to update this by uploading another csv with the course shortname and the enrolment method info, but although Moodle says it has updated the course, the enrolment durations have not changed.
Any ideas would be appreciated.