Knight Rider

We (6people) met today to play around with arduino and do the tutorials. We have two different productions of arduino cards.

our scool (HfG Schwäbisch Gmünd) bought 10 Pieces and i by myself bought 10 as well.

We did the Knightrider Tutorial.

3 people, working with the cards (number 1963, 1960, 1964) from scool, don't have problems The other three are working with the cards i bought (number 1405, 1403, 1398). The lowest pin (2) is not working and we don't understand why If we declare Pin 3 as lowest Pin, Pin 3 is not working?!

What can it be? Is it the firmware of the Chip on the board? Is it possible to update it?