I have been experiencing this problem with google rich snippets data for a while now, sometimes google will show the rich snippets I added to my WordPress post (star ratings, thumbnail, review count, prep time etc), and sometimes it just wont ( with star ratings, review count, prep time etc, but thumbnail missing).
This happens randomly ( I think ) to post I posted recently ( which uses identical rich snippet markup structure ). ( Old posts, like over a year ago which was marked up recently usually wont experience this problem )
I cant figure out what is causing the problem, and re-fetching the URL ( Google Webmaster Tools ) with missing thumbnail wont last long ( the thumbnail will show temporarily, and gone missing again after a while )
This is a screenshot of a post displayed correctly in google search result:
This is a screenshot of a post displayed incorrectly in google search result:
Both of these post have the same Rich Snippets Data structure. ( Can be checked/compared at https://developers.google.com/structured-data/testing-tool/ )
I hope someone can help me find out the cause of this problem
