A comment fails to stay deleted

I had a comment put over a larger piece of text (more than a screen). I got to that part of text and edited a bit. The comment became two, identical (no screenshot of that). I deleted both, and started editing the text. Now every time I edit this part of text, the comment reappears.
Here’s a capture of me just marking the words and formatting them to Italic. Every time the comment comes back.
comment issue
How can I ensure it doesn’t come back?