Hi Marco,
1.- I confirm that the Export method explained by Dominique works as expected. See below.

2.- It's impossible for us to help you with your truncated responses problem if you do not give us the exact complete data of your ordering question. Please provide a screenshot of the exported data in your Spreadsheet.
3.- Sorry to insist, but quiz (even with the order question type) is not the best suited tool for what you want to do. Actually you never said clearly what you are trying to achieve with asking your students to order/rank those items. It would really help if you provided all the necessary information from the start rather than us having to extract it bit by bit.
What is definitely wrong in your approach is that you are using a question which deals with correctness/incorrectness when in fact there is no such notion in what you want.
So, once again, (and for the last time), for the type of responses you want to obtain, the best suited took is a survey-like Moodle activity such as Questionnaire (contributed plugin). Here's a simple example I just made for you.
