After using this wonderful software for a long time, I just realized the following discrepancy:
First Instance - Lets say my first deck has got 78 cards and I use it for a reading, then using (Ctrl+Shift+N), I change deck and use one with 52 cards. In this instance there is no problem because all 52 cards are present when I check it in "free selection" mode.
HOWEVER:
Second Instance - This time, the first deck I use has got 52 cards, then using (Ctrl+Shift+N), I change deck and use one with 78 cards. In this case when I check it in "free selection" mode, there was only 52 cards out of the 78cards. Gosh I never realized this all this while

Is this a bug or am I doing something wrong? Thank you in advance for whatever help given.