New pin number found instead of Old one!.

Hi,

I see a strange behavior in Allegro PCB 16.6. I swap a location - D17 pin in SP6 FGG484 package with AA2 - in Allegro PCB and apply back annotation. Then I want to find the D17 pin in schematic and surprisingly I find new pin number - here AA2 in our example - instead of what I looked for - D17 - and I can't find D17 any longer in schematic? Below picture depicts actually what I find in my search. Click on the picture to see it completely. Can anybody please help?!.

Hossein