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Front-end filtering of blog posts

Hi all,

I am building a front-end filtering system for blog posts so that end-users can filter blog posts by category and author. I am using the following as a guide —

The issue is that I cannot get it work with two filters: category and author. Either is working fine but I cannot filter posts in category A published by author X.

Any help is appreciated.

Here is my public share link: LINK
(how to access public share link)