Child Theme not Loading Custom templates?

I’m creating a child theme of a wootheme on a test site. I have a custom single category page template, category-20.php, that works flawlessly in a “hacked” original theme. But in my child theme, it does not work. My folder structure is identical, and I know that I haven’t missed anything in structure because all the other templates work properly and are in the same folder.

Any ideas, oh Brilliant WordPress Gurus? Thank you very much. 😀