Infinite SEO Category Not Working

I have a theme template called category.php

This template is being used on my category pages such as:
http://domain.com/category/food/
http://domain.com/category/drinks/
Etc.

In Infinite SEO, I am using the following macros:

TITLE: %%category%% | %%sitename%%
DESCRIPTION: %%category_description%% | %%sitedesc%%

However, on my website, both %%category%% and %%category_description%% are blank. Both %%sitename%% and %%sitedesc%% work correctly.

What must I do to ensure %%category%% and %%category_description%% works correctly?

UPDATE: Actually %%title%% also doesn't work in the "Category Title" and "Category Meta Description" fields!