After I changed the "Public visible name" under "Profile" - "Personal data"; I noticed that in the tab "Friends" I now appear twice. In each case with the two names.
At that time I had my name "Diego" under "Publicly visible name" and at some point I had entered "DB".

So as soon as you change the name this name is shown as "new friend".
Isn't that a bug? The system should notice that it is me?