When you type a Bible reference or keyword in a passage box on an automated report (like the Home Page) a drop down list appears. The list contains pericope titles (or section headings) from your Bibles. Libronix is asking you if you prefer what you typed or one of the pericopes in the list.
If you never use this list you can turn it off.
Choose Tools | Bible Tools. Click Pericope Sets. Uncheck Use Pericope Titles in Reports.