The three questions are setup as survey questions. Change them to graded questions and see if that makes a difference. There needs to be a score for Connect to identify correct vs. incorrect answers. As it stands, you don't have any correct answers available, as Connect sees it, because survey questions don't have correct or incorrect answers.
If the questions were graded, there would be a green check or red X next to the questions as you get them right or wrong. The orange dash indicated that this is a survey question.
Odd, I would remove and re-create the questions. Make sure that the questions are created as graded, and never changed to survey.
I would personally also change the quiz setting to Answer all, but I'm not sure if that will make a difference for this issue.