Scoring - not possible`

Hello,

I have created a course that is module based, at the end of each I have a results slide that forces the user to go back to the previous module and start over if they do not pass. At the very end of the course I have it set to use the selected questions which, if done correctly all should be right and they get a final score. I am getting people that are getting 125% and 55% etc... if I have 20 questions and each is worth 5 points how is this possible. I don't know if it is my settings or something else causing the problem. Where can I upload my course securely, I do not want it public. Thank you for any help you can give me.

Stephanie