I find that when we are not seriously looking for an answer or true wisdom that the cards refuse to play along. It's the very same phenomenon that comes into play when we repeatedly ask the same question over and over before enough time has passed when something could have been reasonably expected to change.
When we do this, the cards know we are not seriously looking for an answer and they just refuse to play along. The powers that send us answers, however you envision that, are always there to help us when we are truly looking for help or wisdom on any imaginable topic, but when they think we are asking something we already know the answer to, they generally don't answer, inho, and just random cards come up.
It's like they're going "You already know the answer to that. Call us when you really need an answer."
A second explanation of it, and equally true, in my experience, as the cards do not like to be tested. If you know what I mean. Tarot and being a Tarot reader, by necessity, require faith. You have to have faith that Tarot works to be a reader. And, as with anything spiritual, that faith cannot be given to you, you have to earn it by using the cards and seeing what happens.
We are not meant to be given irrefutable proof of anythign spiritual. Tarot is a spiritual tool. If you try to test it in a scientific way, which imo is what you tried to do, it won't work. It is a tool that requires faith to work. And you will not be handed proof on a platter that will make you believe. It had to build gradually as the spiritual experiences you have with the cards grow more and more frequent.
Nothign spiritual in our lives that take faith is meant to be proven scientifically. Purposely asking questions you know the answer to in an attempt to try and proove Tarot works, is doomed to fail. Faith will not be handed to you in any kind of scientific way, it must be earned in spiritaully.
Part of learning to be a reader is learning to have that inner faith in the cards, faith comes from teh heart and soul and not the mind. It cannot be given you. And the cards truly will answer anything you ask, but they will not be tested. If you try it is normal that they stop cooperating.
Babs