I agree, there must be a difference between the algorithms used in the Home View and the CAS View. However, it looks a bit strange to me. And I suppose, it isn't the result that other people would most likely expect, too. I checked it with the Casio Classpad, the Graphing Calculator by Mathlab for Android and the Microsoft Mathematics (a tiny program for schoolchildren). All of them produced the Euler Number, not a weird expression that has no sense.