Problem Replacing Master Page

The office where I work uses and automated process to import xml files into FrameMaker. When the xml is imported it formats correctly in the appropriate FameMaker template.

In a FM template, there is a master page that includes a Running head that contains the main header and there is a smaller running header. Both use variables that extract the text from an element in the xml file that is imported and inserts the text into the text boxes. This master page is set up to be a left page. There is another master page in the template that is set up the same way except that it is set up to be a right page. It is applied when this first page needs to be a right page instead of a left page.

After importing the xml into this template, the file formats correctly, with the left master page applied as the first page. The text imported into the headers formats correctly. When I replace the left master page with the right master page, the smaller running header text is duplicated. It displays where it should in the smaller running head, but the text in this smaller running head is also duplicated in the text box beneath it.

This is occurring in Structured FrameMaker 8,as well as in Structured FrameMaker 11. Is there a way to fix this so that when the right master page is applied the smaller header text is only applied once in the subheader?