In RobHelp 10, the Style and Font boxes in my project keep flashing and changing. How do I fix that?

It does not happen right away when I first open the project. I worked on the project and then gave to someone else to update. When I click on my original topics it seems fine. Then I select one of the new topics and click inside the topic and then it continually happens in all topics even the ones that were fine when I first opened the project. The Style, Font, and Font size boxes continually change back and forth from Normal, Times Roman, 12pt to Heading 1, Arial, 18pt.  It's changing very quickly back and forth between the 2 settings.