Well, I don't really put much into psychic powers, and less into tarot, but... Ever think maybe, every once in a while, something can just... Fail?
We've all seen it, we're sure we did everything right, but it just didn't work out this time... Sometimes, things just don't work out the way we expected. If we knew what the results should e before hand, it wouldn't be that much of a power... And if we didn't get what we wanted, well... It happens.