There could be any number of reasons for failing the WBI. The most common cause is to not realize what the question is asking. The next is to answer similar questions differently, that is suspicious to Disney. My advice is to use strong answers and be timely with your answers. Put your phone away and concentrate solely on the questions. If you fail, then it is not the end of the world. There was just something Disney didn't like and chose not to pass you. If you can, reapply or try for one of the PIs, though they are very competitive.