Hi,
We are not able to replicate your issue. The quiz link, as well as post setting link on my test site, is working properly.
We had login to your website and notice that your website has a lot of plugins. We request you to check for plugin/theme conflict on your website. To do this disable all the plugins at once and enable them one by one after checking which one is creating the problem. Also, change your website theme to a default WordPress theme to check whether it isn’t creating the problem.
Regards,
Kriti