Issue with sample hand generator

I noticed a problem when I went to use the sample hand generator after building a deck. No matter how many times I used the feature I never was able to draw duplicates of cards in the deck. This is misleading when I am trying to test the deck and see how much I will be drawing one or more copies of a certain card when I am playing a game. The feature seems to only pull from one copy of each unique card in your main deck, instead of pulling from all copies of each card