Make sure your header.php file has this before the wp_head function:
<?php wp_enqueue_script( 'comment-reply' ); ?>
Note:
Some themes may use the comment-reply function in the themes function.php file.
Caution:
I’ve scanned your theme and I notice it’s using an outdated version of TimThumb which is a serious security flaw. You can install the TimThumb Vulnerability Scanner Plugin to do an auto-check, it also updates TimThumb to the latest version for you. You should fix this immediately.
UPDATE:
The question continued via email. The theme worked fine on my site which led me to believe it was a plug-in conflict. I suggested the standard undershooting steps:
- Disable all plug-ins
- Enable them one at a time to reveal the conflicting plug-in
- Remove the plug-in and find one to take it’s place or attempt to make
changes to repair the issue.