I didn't see this bug get mentioned, but I ran into an instance where if I had multiple glizzard vouchers when I would sneak one into Kali's bag, I would lose all of my vouchers. I tested this on Jade, Blossom, and Celeste, and I found this to only happen with Kali.
Thank you for the report, I believe I figured out what happened, everything looked fine in relation to the code with Kali, her code is the same as the other girls, but there were a two instances hidden within the hotdog contest themselves that could set a player's voucher total to 1 rather than adding an additional one, the code has been changed to make that no longer the case. My advise would be just to use your vouchers as soon as you get them rather than stockpiling for the time being.