Rick:
It looks like the two property objects have the same GUID (very long identification in the brackets). Open one of the objects and do a Save As... to change its GUID, and remove the old part. I found that if I duplicated objects in the Finder, the GUID would also be duplicated so the parts were showing up as doubles, even though they have different names, I needed to do a Save As... to copy an object and give it a unique GUID.
HTH
David