Yeah, theme update cleared it. I spent 5 hours trying to find out why the trailing slash isn’t working, even telling it to force one. Clearing all of the plugins didn’t fix it. All other slashes work except for that specific header. I have to just keep fixing it manually I guess.
Well, that’s usually how it goes. Once you create a support thread, despite trying to resolve the problem for the last three hours, I managed to solve my problem within 10 minutes of my post. The issue is Youzify, and it was trying to call on a login page that did not exist. I’m not sure why this resulted in a redirect, but the problem has been solved since I corrected the URL.