The number two reason is your psychological state , the thoughts, emotions, feelings, images, desires, hope, wishes, etc. These things can influence the answer. The third source of pendulum inaccuracy is lack of patience . Approach the pendulum one day at a time. Watch, wait, see and try again.
Inaccuracy occurs when there is lack of concentration .
Practice focusing on the questions until you are able to concentrate and hold your attention steady during the time you are working with your pendulum. In the beginning there is a tendency to consult the pendulum every time you have to make a decision. Do not depend on it to the exclusion of your own common sense. The pendulum is not designed to predict the future. This is because future events are not set in stone, but are determined by people's free will.