Captivate 6 : issues on reporting with csod

Hello,

I published in SCORM 2004 a module on captivate 6 with parameters on the quizz. Above 80% the module is completed, under it's not.

The reporting is correct on csod for 600 pers. But I have 10 pers that are completed but score under 80% and 40 pers that are incompleted with score above 80%...

Coudl that come from captivate issue? Should I change some parameters?

Thanks for your help!