Students Disappearing from Course, Courses disappearing

Hi!

Thanks for your plugin! I use Masterstudy – Education WordPress Theme and have already contacted their support, yet – I’d like to ask also here.

The following has happened several times: either all the students from a course get missing and I get a message No students in course yet…
Or a whole course content disappears.

This is very frustrating and we’ve to manually add the students to the course because of that.

Any ideas what may be causing it?

The page I need help with: [log in to see the link]