I have no need to exaggerate for effect. These were failed interactions with multiple guests in a row.If it were not working, I expect there would be more than just one person remarking on it.
As it stands, it seems much more likely that the sole person experiencing this just fell into the 25% portion a few times.
"10+" failed interactions seems like an exaggeration for effect. Particularly as a guest leaves after 3.
As for no people remarking on it... let's turn the question around, can you confirm that the 75% chance card has actually triggered for you, when playing the current version of the game?
What worked for me was a character trait. I didn't check the other cards (the 25% and 50% ones) it is possible they are bugged along with 75% one.It did work once for him, so it's obviously working.
The only question left is "Is the 75% chance mark accurate?".
Maybe there was a typo and it only has 7%.