Google database update

Hi guys/gals,

What do you think of this:

I modified a paragraph on my main page. It's an old site and already indexed long time ago. I pinged it and 2 hours later, I did a search on Google and it's updated with the new paragraph. The problem is after 12 hours, when I do a search, Google shows back the old paragraph. Any idea what is going on? This has actually happened twice.

 

Its a difference of cache i would assume

 

I actually used NoArchive tag for that site. Is that the problem? It's not a blog and just a static site.

 

This is a great idea, continue with the database update as planned.