Quiz Questions Not Apprearing On the website

Hello,

I have created quizzes and it was working fine….but of recent i discovered that some my quiz are not showing on the website again while questions remains on the back end….the admin area

See admin area with questions (60 questions) – https://www.screencast.com/t/bwyfG5qU
See the front end i.e. the website with no questions displayed – https://www.screencast.com/t/i6KD7cYbX

Kindly help….

my server is ngnix

The page I need help with: [log in to see the link]