The name of two students that I have enrolled into my Canvas Instructure free for Teachers account have disappeared. They had already accepted their invitations and were a part of the course. Now their names have disappeared. When I try to submit their email addresses again, it comes up with the name of another student in the course. I have had to let them create new email addresses and do it all over again, but it has happened yet again! Come on people. My students are losing confidence in this LMS platform already and we just started. Is it because its free?