If you attempt to import a contact via drag and drop (vCard) that duplicates the name of a contact that is already in the contact list you will be prompted to Review the duplicate with options to keep the old, keep the new, keep both, or update.
However, when going through iCloud and the contacts are
[b]identical[/b] they are recognized as the same contact and no change is made. However if there is a slight variation in spelling or address or some other element a new contact will be added. The variation prevents the two entries from being
duplicates. In your case, you forced all to be identical therefore no entries were (I started to say duplicated) but perhaps more accurately it would be repeated or doubly entered?