Moddle not receiving data from storyline scorm 1.2 correctly

Hello ,

I have uploaded a Storyline scorm to use in Moodle. 

The majority of users have been through the course and passed the test at the end with no problems. But we have had more than a few get stuck. They always get a suspended report and a score of 10. They have sent screen shots proving they have 100% on the test but moodle never updates 

Here is a screen shot of the attempt. 

Im wondering why its for some and not others, any help is greatly appreciated