Questionnaire (plugin)

Hi,

I've just poster some questionnaires on my courses to get feedback on the use of the internet and Moodle in the course.

Could anyody explain why the total responses and percentage don't correspond to the total of each possibilities, whereas I have opted for the "Respond once" setting.

Example:

What is your mother tonger?                                            TOTAL
French                 83 %                                                        5
Chinese                50 %                                                       3
TOTAL                 100 % ??                                                   6 ??