During 3d view double click the object, this open the family then select the component and on the import instance tab select visibility settings make sure that the detail levels match or just select default then select Load into project
PS i'm not expert on Revit maybe there's a better way but this worked for me
I know this is old but its the first one I found. So figured I would give an update.
I too had this problem.. found the issue was a sloppy familie with embeded families.
Although it was a plumbing fixture, the embeded families were from the generic model family group. My 3D views all had Generic Model families turned OFF in visual graphics. Fixed the subfamilies and viola all showed like it should.
Hope that helps someone in the future.