The way the repeat questions in a different format with slightly different answers leads me to believe that the are looking to evaluate, in order, your strengths. There are probably 4 or 6 (as they divide well into 108) areas that they assess on. You may be confronted with a repeat question with all but only 1 or 2 possible answers different, but then they will know how much you prefer one thing to another, not necessarily having to contradict previous answers because the available answers are different.
I hope this makes sense...