Re-publish contents required to fix duplicate meta descriptions

Fixing the template is not enough to fix duplicate meta descriptions! I have to republish the content before it considered fixed.

Last month when i logged on to webmaster tools and browse to html suggestions, i found about 133 duplicate meta descriptions on my google webmaster tools. I search around and read few article to fix this, it said that i have to change the template html to fix this. I have to put/replace meta content inside <b:if> tag so description will only applied to main page.

<b:if cond='data:blog.url == data:blog.homepageUrl'>
<meta content='description here' name='description'/>
<meta content='keyword here' name='keywords'/>
</b:if>

Hmm.. that make sense, i did that, but after 2 weeks my webmaster reports still no change at all, still 133 duplicate meta descriptions.
Few days back, i re-publish few contents (9 posts that have same meta description) without changing the content, just edit then re-publish.. When i log on to webmaster tools today.. bang!! duplicate meta description down to 124.. damn.. now i have to republish 124 others to fix it..