Not working for a Particular Cat.

I seem to be experiencing a glitch with Custom Categories. When I turn it on on a particular Cat., the content is blank ie. I only see the header, sidebars, etc. Also when it’s on, the Cat. name replaces a menu link that is usually “Contact” (weird).

When I turn it off, the normal content of my Cat. re-appears ie. Cat. name and associated posts. I’m at a loss because it’s only happening with one category, which is seemingly identical to others where the plugin is working fine.

Thanks in advance.

https://www.ads-software.com/plugins/custom-category-template/