If the above tracking data is accurate then the user hasn't completed the course. You have 59 blocks in your course, 35 of which are still incomplete. And, if it includes an assessment, the user has not passed it.

What you need to do is figure out if it's:

1. learner error
2. course design issues (perhaps exacerbating the above i.e. it might not be clear to the learner that they need to complete everything)
3. a technical issue

WRT to 2. you might this helpful.