Structured Data Items Going Down

Greetings, I have a small but growing wordpress site, [url]www.bestmastersfitness.com[/url], I’m using microformats.org for my structured data markup.

I’m puzzled because in google analytics over the past 30 days my reported number of structured data items has dropped from 577 items to 379 items.

This has been a rather gradual decline, no cliff dates. I haven’t changed anything (that I’m aware of), and have been adding new content (posts) by
about 5 posts per week. I’ve checked some recent posts with the google rich snippets tool and all looks fine, but still that would not explain the decline.

Any thoughts about cause/effect/cure?

Thanks for your help!

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