URL Parameters are not working

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URL Parameters are not working in this page.
We want to filter the author index using URL parameters.
Ex: When a user clicks on A, the page should show the authors where name starts with letter A.
Here is the code I am using
https://prabuddhabharataarchives.advaitaashrama.org/author-index/?wpda_search_column_author_name=A%

I went through the documentation and tried everything but it is still not working.

Can anyone please help ?

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

 

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