This looks like it used to be an old bug with version 1, but it appears to have made a re-appearance.
Basically, I have a regular file. I add a bunch of comments. Then when I go through and delete the comments, strange things happen. If I use the ‘x’ to close them out, sometimes it works, sometimes it doesn’t. If I select the comment and hit the delete key, it goes away, but when I re-open the file, some of those comments are back.