Duplicate Course leads to data loss

I animated a cours for 60 students. I created a course with the course press plugin. They used this course and filled in a lot of information.

When i duplicated the course, i lost all the data they put in. I checked data in the old course and the new one. Nothing showed up.

Strange thing was that students were now also linked to the new course.

(created a new topic as asked, work will be finished with my students for this week-end) So i will be able then to try to update the plugin, reproduce the error, do the plugin conflict test, (no cache activated), and come back to you with more precise information. :slight_smile: Thank you