It works for logged in users, 404 for everyone else?

My friend runs https://www.sticksoffire.com — a hyperlocal blog for the Tampa Bay metro area… He was planning on (and is) covering Super Bowl 43 stuff as the game nears.

We had created a customized page template specifically for posts under one certain category. I can attest that everything looks fine with a custom header and sidebar in this template and the page works for those logged in to WordPress at https://www.sticksoffire.com

…But that’s the rub. Anyone not logged in who visits https://www.sticksoffire.com/super-bowl/ will get a 404 error message while seeing the standard template for the site.

What would cause something like that to happen?

(and I apologize if errors like this have been discussed before, I didn’t even know what to search for)