Harvest Divination Card Sacrifice bug

I dropped a Seven Years Bad Luck card from a stacked deck and figured I would gamble it to try and maximize profits. Upon my first attempt, I was successful, leaving me with two cards. My second wasn't so lucky, dropping me back down to one card. I tried to duplicate it one more time and... nothing happened. It consumed 1500 lifeforce but the card neither doubled or deleted. I was nervous but immediately did it with the same result. I lost the 1500 lifeforce but the card remained at 1. I'm a bit upset because I believe if it were to fail and remove the card, it would do so successfully, leading me to believe both of the bugged attempts were successful and that further rolls only increase the chance of losing the card, but gaining nothing.

I don't know how to attach a picture showing a before and after of something you didn't plan for - like encountering a bug, so you'll have to take my word at face value. Be careful.