If what you say about the Kardashian wager is true, then they must have fixed it because by the time I saw it, it said: “WILL ANY MEMBER OF THE KARDASHIAN FAMILY ATTEND A CAVALIERS GAME DURING THE 2018 NBA PLAYOFFS?” I would feel very comfortable wagering on that description.
Another possibility - and I’ve been guilty of this before - is that Bookmaker had one line of the wager’s banner be very vague but they had another more detailed banner that you missed. Bookmaker seems to do this a lot.
I do agree that you have to be very careful analyzing he wording of these props before you bet though.