Querry won’t work on database

I am unable to sort with the name Dixon on this database: https://leecountyhgs.org/history-books/

The same issue is happening on this one too: https://leecountyhgs.org/newspapers-dixon-only/

You would need o be a memeber or admin to see them though. What can be done?

Thank you,

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