I've just spotted some doors I've been working on seem to have a suffix added to the familar Object Type: Family Name:Type Name, they have a suffix of :R0 there, so it is in the format of Door:Door Family:Door Type:R0.
Any idea what the 'R0' is, and what it might signify? This is only to some doors, all within the same family. Others of different families don't have it.
Similarly some walls have the suffix of :R4 to them, but again not all?
Sounds like something unique to your project? Can you share a screenshot of the project browser? If someone duplicates an existing type Revit will usually add number to the name, for example Basic Walls > Generic 200mm 2 where Generic 200mm was the original.