Listings URL

I have listing categories, they are appearing on the home page, but the page the categories link to are not found.

I have computers listing, with taxonomy of tablets. I have a product page called ipad which I have categorized with tablets under computers.

Now when I preview an actual listing (which works), the URL is something like: /listing/ipad/

However the links from the home page (which aren’t working) are like: /computers/tablets/

What should the slugs on the homepage be?