Wrong score in Chrome?

I have created a SCORM course in Captivate 9. There are 5 quiz questions at the end, worth 20 points each. When a user takes the course in IE, all seems fine. But when a user takes the course in Chrome, their score reflects incorrectly in our LMS. For instance, I tested the course yesterday in Chrome and achieved an 80% score, but my LMS transcript reads 60%. Any idea why this would be occurring in Chrome only? Thanks in advance.