Some time ago, some users identified that there might be an issue with your Adobe Captivate eLearning courses in the latest version of Google Chrome (version 80). When learners close an eLearning course by closing the browser window, or simply opening another webpage, the commands that would send final scores to the LMS would be lost.

This article explains the issue in greater detail: https://helpx.adobe.com/captivate/kb/unable-report-completion-status-lms.html

The good news is that Adobe has developed a hotfix for Adobe Captivate. You can download the hotfix from here: https://helpx.adobe.com/captivate/kb/hotfix-lms-reporting-issue-chrome-80.html