From AC14 help:
Objects of Ambiguous Origin
An object in this category has been placed in the project, but duplicates of this object (that is, objects with the same ID as the placed object, though they may be named differently) exist in at least two linked libraries. ArchiCAD randomly uses one or the other source for the object’s placed instances.
To avoid this situation, you should replace the placed instances with one of the duplicate objects from the loaded libraries.
(To do this, you can use Find & Select to locate the placed instances of the ambiguous object. Then choose a library object from the loaded libraries to replace the ambiguous object.)
Erika
Architect, Consultant
MacBook Pro Retina, 15-inch Yosemite 2.8 GHz Intel Core i7 16 GB 1600 MHz DDR3
Mac OSX 10.11.1
AC5-18
Onuma System
"Implementing Successful Building Information Modeling"