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Google Investigating Bugs With Structured Data Report In Webmaster Tools
Don't worry, you're not alone - many others report their structured data reports have declined significantly within Webmaster Tools.
There are hundreds of complaints within the webmaster and SEO community around the Structured Data report within Google Webmaster Tools showing massive drops in structured data elements being shown.
The good news is that everyone seems to be affected by the issue and that Google’s John Mueller said on Google+ that Google has “been looking into it.”
Here is a screen shot that I personally see on one of my sites, but is similar to what everyone else is seeing on their own Webmaster Tools account:
So if you are worried about this drop in your structured data, do not – it seems like a reporting glitch within Google Webmaster Tools that Google will fix in the near future.
Google Webmaster Tools is known to have reporting bugs fairly frequently.