Correct answers in exam are marked incorrect when student exits exam and returns.

For anyone who might have this issue in the future, I did get a recommendation from an Articulate Customer Support Engineer. After reviewing my .story file, this was his recommendation:

If you are using the built-in Graded, Survey, and Freeform questions in Storyline 360, each slide needs to have a "Submit interaction" trigger. This trigger validates the question and saves the answer before moving on. Apart from this "Submit interaction" trigger, you must also have a "Submit results" trigger for the scores to be submitted to the LMS. Both these triggers will save the information to the LMS. If we don't have a "Submit interaction" trigger, the question will be reported as incorrect.

I went through and added the Submit interaction trigger to each question in our question banks. The Submit results trigger was already applied to the "Submit" button. I had high hopes for this solution since the logic made sense. Unfortunately, after updating the exam, we are still consistently seeing correct answers marked as incorrect (the student's response shows in review and the checkmark indicating the correct response also shows, and they often match, but the feedback shows "Incorrect") if a student leaves the exam before viewing results. This is common as the wifi in our facility isn't too spiffy and our students frequently experience dropped connections, which causes the page to time out and close, requiring the student to launch the exam again. They are returned to the last question they answered, or the submit page if they've already answered the questions, so they don't see a problem until they review the results.

I'll post more when I am able to connect with customer support again.