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My users are currently experiencing 404 error when they enter a wrong password, or a wrong email address. Basically, the error pages for member.php redirect to a 404 error. I believe it may have something to do with renaming index.php, but im not sure. I did rename the redirection to forums.php in member.php file.

My website is http://1shotgg.com

I don't know when this error started happening.

if your web host panel has error log then that should have a clue. looks like CloudFlare smart errors is affecting ..

Can't find anything related to member.php on my apache error logs

have you disabled cloudflare smart errors to check if it fixes referred issue ?
have you modified anything related to 404 error in the .htaccess

Edit: remove two occurrences of jQuery.noConflict(); from headerinclude template and then check