I was able to duplicate this, and have added it to Bitbucket.
This puzzled me at first but actually this is intentional. Panorama won’t let you set up two fields with the duplicate names. If you do, it adds a number on the end. So if you already have a Name field, and try to rename a second field as Name, it will change it to Name2. Since you already had a blank field, when you tried to make a second field blank, it renamed it to 2, i.e. blank with a 2 after it.