I just took a look at your site. I see on the sheet “Organizing Rec MLS uniforms for distribution to teams” for August 16 it lists 6 open spots on the main listing and then I click into it there doesn’t appear to be anyone signed up so it should list 8 open spots. However, when I view the page source I am seeing this comment in the HTML…
On /volunteers/…
<!-- Dynamic page generated in 1.057 seconds. -->
<!-- Cached page generated by WP-Super-Cache on 2013-08-03 00:34:30 -->
On /volunteers/?sheet_id=9…
<!-- Dynamic page generated in 1.028 seconds. -->
<!-- Cached page generated by WP-Super-Cache on 2013-08-02 09:47:05 -->
On my end I am getting this same result in Firefox, Chrome, Chrome (incognito mode) and Safari. It appears some caching may still be in effect. Were you logged in on FireFox? Depending your settings caching may not be in effect for user your are logged in or users that have a specific access level. I hope that helps, but please let me know if that doesn’t solve the problem.