Smilies not showing up properly

On my forum, no smilies are being rendered in any posts. I have added a few extras, but none of them are working correctly.

See this post: http://mattelmore.com/forum/viewtopic.php?id=1020

However, all smilies display correctly on: http://mattelmore.com/forum/help.php#smilies

here are the relevant lines from parser.php:

$smiley_text = array(':)', '=)', ':|', '=|', ':(', '=(', ':D', '=D', ':o', ':O', ';)', ':/', ':P', ':lol:', ':mad:', ':rolleyes:', ':cool:', ':angry:', ':happyfinger:', ':rofl:', ':wtf:');

$smiley_img = array('smile.png', 'smile.png', 'neutral.png', 'neutral.png', 'sad.png', 'sad.png', 'big_smile.png', 'big_smile.png', 'yikes.png', 'yikes.png', 'wink.png', 'hmm.png', 'tongue.png', 'lol.png', 'mad.png', 'roll.png', 'cool.png', 'angry.gif', 'happyfinger.gif', 'rofl.gif', 'wtf.gif');

There do not appear to be any errors regarding this in my apache error_log.

Any suggestions?

Thanks