It's an issue with Gannett's web platform, which is Presto. They also had the same issue with Saxotech.
Basically ... the URL can be tweaked by anyone. Whenever a web headline is changed, it spits out a new URL -- everything is the same except the web head. This allows stories to get some benefit from SEO by also including the current headline, at least that's how I understand it, while also allowing the old headline to drift back to that same story. What it means is the portion of the URL that contains the head can be changed to anything your heart desires, and still work.
I read somewhere that the Tennessean said someone -- a reader, not a staffer -- played with the URL and then sent it out on social media where it picked up steam.