These errors has nothing to do with our plugin, but may cause it to malfunction.
We did a simple test quiz on the website. This test quiz has only one question.
We can see the results page after submitting this test quiz.
The following is a screen-cast of my test.
Given the above circumstances, I cannot be sure whether it is an issue with our plugin or an issue caused by third party software errors on customer’s website.
Therefore, please create a staging website with a WordPress default theme and no third party plugins. Install only QSM plugins and replicate the issue. Our developer will need an environment free of other third party software errors in order for us to troubleshoot any QSM issue.