It's not a "mistake". NPC names are not meant to be unique. Hence the reason you can't issue an arrest warrant for an NPC unless you are at the same location. Their ID numbers are the unique identifier, not their names. Only PCs use handles as a unique identifier.
"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
Yes, each NPC has it's own unique ID, but I was asking if there is an option when there will be two NPCs in the Combine named the same? Like Builder John Jones and Rifleman John Jones. They both have the same name but different IDs and class. I was just wondering if a situation like that is possible.