[Plugin: WP Super Cache] WP-Super-Cache not updating all pages

I am getting some quirky results with the plugin, where Firefox seems to work fine but Chrome and IE 7 shows different results. Specifically my home page seems fine on all 3, but for Chrome and IE some of my category pages aren’t being updated.

In Firefox 3.6 when I view the page source for
http://chattahbox.com/category/entertainment/ I see:

<!– Dynamic page generated in 0.486 seconds. –> <!– Cached page generated by
WP-Super-Cache on 2010-10-07 12:14:46 –>

When using IE 7.0.6, and view the page source I see:

<!– Cached page generated by WP-Super-Cache on 2010-09-20 14:22:42 –>
<!– super cache –>

Here is my .htaccess file btw

# BEGIN supercache
<IfModule mod_mime.c>
<FilesMatch “\.html\.gz$”>
ForceType text/html
FileETag None
</FilesMatch>
AddEncoding gzip .gz
AddType text/html .gz
</IfModule>
<IfModule mod_deflate.c>
SetEnvIfNoCase Request_URI \.gz$ no-gzip
</IfModule>
<IfModule mod_headers.c>
Header set Cache-Control ‘max-age=300, must-revalidate’
</IfModule>
<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType text/html A300
</IfModule>

# END supercache