URL / Templating system advice [closed]

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Do you have:

  1. A category somecategory defined?
  2. Posts categorized with somecategory?
  3. Some default else: content in the Loop in category.php?

I suspect the URL is returning a 404, and WordPress is simply serving up the root URL, because it has no content to serve up from category.php.

EDIT

You don’t need to do anything special to get WordPress to use the category.php template. It is a built-in part of the Template Hierarchy. You simply need to have a category created, and have Posts in that category.

EDIT 2

Can you try resetting your permalinks?

Do you have a live site link, so we can see the problem in action?

What is the markup of your category.php template file? Can you post it?