Problem with Draw From Question Bank and related Results Slide Grade

I have a question bank with 15 questions in it, and I have it set to include 10 questions, drawn randomly. 

The associated Results slide is set that users need 100% as passing grade (if they get 100% they get a completion report which enters them into a prize drawing)

I have a status on each question updating them with their grade, and a button that allows them to quit the test and restart (clicking resets the Results Slide score).

For some reason, when I test in Articulate Review, the question bank draws more than 10 questions, sometimes 11, sometimes more. I think this happens because it repeats questions that it draws, and it doesn't count repeats as new questions in the 10 draws. I do not want users to repeat questions. I should note that each question is individually set to Score by Question, Attempts: 1.

It also gives the user a 100% score after answering one question right. I have each question set to 10 points per correct answer. 

They should only get 10% at a time per correct question. 

Please advise.