Something in your course content would appear to be causing this issue.
First you need to confirm whether this issue would happen for any course from your Captivate installation. So quickly create a very simple Captivate module with a single True False quiz question with the same quiz settings as your current problem course module. Publish the simple test module to SCORM and upload to SCORM Cloud. If that module works perfectly, the issue is not Captivate output per se but your particular course.
The next step is to try and isolate WHERE in your course the problem may be. You have already shown that it is unlikely to be the SCORM version. So it is probably something on one or more of the slides in the course.
To isolate whether the issue is inside the content area or the quiz area, do a SAVE AS and create a copy of your project file for the purpose of experimenting. Hide all quiz question slides in the project and add a single True False question that has no customisation or changes. Test this module in SCORM Cloud to see if the issue persists. If it does, then the issue is somewhere in the content slides not the quiz. If the issue disappears, then try unhiding quiz slides and retesting until you see the issue reappear.
If the issue is not in the quiz area, do another test where you hide all content slides and just add one blank content slide instead. See if the issue disappears when testing in SCORM Cloud again. If it works fine, then your issue is somewhere in the content and you can start unhiding slides or groups of slides to find the slide causing the issue.
Yes it is tedious. But in practice this may be the only way to find your issue.
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