Why is the fortune teller's good spirit ineffective?

Don't trust such things. If a fortune-teller can really count, he won't do it. If you two don't believe it, the bad ones won't work. Maybe something said by the fortune teller affected your psychology and then "worked". Fortune tellers usually look at some details to get to know you. In fact, it is up to you to decide the direction of things in the end. Do your best. A good result is of course the best. If the result is not so ideal, there is nothing to regret.