We upgraded 6 Joomla installs with no issues, however we have one that is exhibiting an odd behavior.
Say I have an article ID of 909. If I end the URL with a valid article id it will display the content of that article. It should go to a 404 page.
domain.com/909/ <-- Display article id 909
domain.com/about/900/ <-- Display article id 900
domain.com/contact-us/855/ <-- Display article id 855
domain.com/contact-us/blah-blah/ <-- Display 404 page
All these URLS will resolve and display the content when it should go to a 404 page. I figured maybe there was a bad router somewhere but I literally replaced the core files with a fresh install. I'm still getting the behavior.
Any ideas?