It appears to me that the order you are seeing is within the question database, which automatically sorts questions alphabetically, if I am seeing things correctly.
The order in which questions appear in the quiz is based upon how you add them to the quiz, and whether or not you are randomly selecting questions, and have "shuffle" enabled.
The order in which questions appear in the quiz is based upon how you add them to the quiz, and whether or not you are randomly selecting questions, and have "shuffle" enabled.