You have linked a model into the current project, but you cannot see the linked model in some views.
Issues and Solutions: To determine the source of the problem and resolve it, try the following:
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Reveal hidden elements: Open the view in the host model and click
(Reveal Hidden Elements) on the View Control Bar. The drawing area displays a magenta border, and hidden elements display in magenta. If the linked model displays in magenta, right-click it, and click Override Graphics in View
By Category. On the Revit Links tab of the Visibility/Graphics Overrides dialog, select the check box in the Visibility column for the linked model.