Corrupted lessons in RISE

I have a RISE Module in which it seems like some part of it has been somehow corrupted. It looks like I have been caught in some kind of "edditing process" and the lessons are not visible when previewed. My take on it would have been to delete the Lessons, and import them again from the original course - but I can't delete the specific lessons. In the rest of the lessons the delete option is shown, but not in the two last ones.   

Please see attached documentation.

I did find this earlier Discussion - but no solution in there.  https://community.articulate.com/discussions/rise-360/deleting-blocks-in-rise 

3 Replies