I call it the master address because thats the first address made for that wallet.dat file.
You can call it magical address.. but this still won't make your address magical.
Are you missing any coins / private keys?
Or is it just a "cosmetical" issue with your "address not being in the right tab" ?
Did you already try to list all of your unspent outputs? 'Help' -> 'Debug' -> 'Console' -> Type
listunspent.
All of your addresses which have UTXO will appear on the screen.