Game Piece Inventory Window Question

Running ver 3.1.19 on Win 7.

I am counting cards in various decks using a Game Piece Inventory Window. After loading previously saved decks the total number of cards shown is the sum of the original deck and the newly loaded deck. The decks contain the correct number of cards however if I use labels for the pieces in the GPIW there are duplicates. Is there a way to reset the card count when loading a saved deck?