When and how Revit section markers display on plan views can be a bit confusing when you are working with multiple disciplines. With more disciplines involved with a model, the more noticeable and confusing the issue becomes. This is due to the fact that section markers are discipline-specific and cannot be displayed on all the different disciplines of plan views.
Revit is designed so that section markers will not show in other discplines’ views and this is based upon the Discipline parameter of a view. Revit has 6 different Disciplines available for selection for a view. They are: