Cache, or something else?

This question is regarding my site: colinmorganfan.com

I’ve been trying to change the category separator on my posts from a comma to a dot. For example, I want “2012,Events,Videos” to turn into “2012 . Events . Videos”.

I fiddled with the codes, and I got it to work, except it doesn’t seem to effect the older posts of the site. You can see how it works for the newest blog post but doesn’t seem to effect any of the older ones.

This is what I changed in the codes:

I changed this:

<li class="categories">
<p><?php the_category(',') ?></p>
</li>

To this:

<li class="categories">
<p><?php the_category('･') ?></p>
</li>

I tried everything.. I emptied the cache from my browser, and all my cache plugins. I even went and deleted the old posts and reposted them in a new post! I also tested it by changing the categories. The comma doesn’t go away. Something is happening that I don’t understand.

I’m not sure what else to do, so I was hoping someone might have some insight on this.

I appreciate the help.