Have the same issue with two notes. No note content however was able to change the titles. The notes would not allow me to add a pdf drawing set. One of the notes was in my account for over a week and never allowed me to deleted, would just keep popping back into the original notebook. I found this as a fix: On Mac, right click, select move to trash, quickly right click again and it glitches to show the options for in trash delete, select option to Delete Permanently. This deleted the notes from the folder. Not in any way an acceptable solution, but for now it seems to have worked.