Hi Pam,
We have visited customer’s quiz.
BRONZE SEO certificate
We were able to complete it without any error. The following is a screen-cast of my test.
https://drive.google.com/open?id=1JuDLgrweX_pTr0Z9KQ3usfTMBTUCFvO3
It could be a cache issue or browser issue for customer’s users.
1) Please clear your cache plugin’s cache content.
2) Please tell your users to use either Chrome or Firefox browser.
3) Please tell your users to clear browser history before attempting the quiz.
As for mentioning issue on android mobile version, please use Chrome browser on android. Remember to clear history before attempting quiz.
Regards,
Kriti