301 Redirect Index Page. Members and Leaders redirecting error.

While working on my websites search engine optimization (SEO), I redirected the .index.php page to the main page to avoid duplicate data:

     Redirected:    http://website.com/index.php

     To:   http://website.com/

I've noticed that the links Members "Top", "Online" and Leaders "Men", "Women" on the main page are now redirecting to the main page instead of displaying the profiles.

Any idea why this might be happening and how to resolve the issue?

This can happen if there is any javascript problem or javascript has not loaded from the server. Check for that.

Starting to narrow down the problem a little bit. 

It appears that the links work correctly in Safari, Google Chrome, IE8, but do not work correctly in Mozilla Firefox. 

Still open for suggestions on trouble shooting.