Historians are learned individuals who write the academic form of any history.
But sometimes working on the same issue two different historians may conclude to a different interpretations despite of using same facts.
Basically it happens more often because the historians work with their own perspective,own vision. So in case of using same facts same facts they look back to the past with own mind and they interpret the past on their very own way.
Political view of a historian is also a important reason for this kind of situation. For example a Right wing historian and a communist minded historian will always think of the same incidents in two different ways because of their own political perspective.
So it is a common issue that historians may find different interpretations of the same event using same data.