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It's not a different url in my case either.
abates,
Are you suggesting it is intermittant for you? It is 100% reproduceable for me on any data centre. You will expect different snippets for different search phrases - that's normal.
Looks to me like either different versions of code or databases are used depending on the search phrase.
What is your site PR mywifesays?
Higher PR get their serps updated quicker