I need some help troubleshooting an issue. (I am guessing) when our site was originally set up it was decided that page not found errors would be sent to the home page instead of an error document. I am wanting to change this and handle it properly. However, the site does not seem to respond to ErrorDocument directive within .htaccess (it is in the / of the site).
Currently I have the following line:
ErrorDocument 404 /404.php
However this is being ignored and users are still being sent to the home page. I have tried looking at headers using plugins, but of course it only returns the 200 OK for the home page that does load.
So where do I go from here? Is there a way to trace this to find out what file has the directive that is forcing people to the home page? Open to suggestions.