If an 'include file (for example, header.h) has changes made to it, the process status of any modules, including the file, should be marked "out of Date" and the hierarchy of the design should be re-evaluated. The status is not being properly reset.
Solution
Project Navigator does not properly analyze 'include files for status and hierarchy display.
To properly reset the project status, open and save the file from which the library file is included.