1) Please go to (login and enroll you self):
2) Put in some numbers
3) Click next
4) When click Previous to see your results.
Then you see: https://screencast.com/t/RMeGzbeYd
The point : how can an text Questions be Correct/Incorrect? without any settings?
How can a text field be wrong? Either it should be marked as "not answered", and correct needs to be correct.