You indeed have a duplicate content problem. The PageRank for the www.telikin.com/index.php page is not contributing towards the PageRank for your www.telikin.com page. You should 301 redirect www.telikin.com/index and www.telikin.com/index.php to www.telikin.com. Personally, I don't know how to write the actual redirect, but make sure when you do it that your home page works as you could potentially create an infinite redirect when messing with your site's index page.
The trailing slashes don't matter, meaning Google knows www.telikin.com/index.php/ is the same page as www.telikin.com/index.php, so you don't have to concern yourself with that.
