There are several possible reasons for this. Because genetic inheritance is random, your DNA doesn’t match other family members’ DNA exactly, so neither will your results. Your parents’ connection to their ancestral journeys will likely be stronger than your connection because they're a generation closer to the ancestors of the journey, which is another reason they might have a region or journey you don’t. Or you didn’t inherit enough segments of the DNA that connect one of your parents to a journey, so it doesn’t appear in your results.