Google AMP error report in Search Console scans for errors differently now
You may see more or fewer AMP errors in your Google Search Console report. No need to worry — It was an internal change and does not impact ranking or indexing.
Google’s AMP error report in the Google Search Console now scans for AMP errors differently from the way it did in the past. That means some of you who have deployed AMP for your site may see a new vertical “update” line on the AMP error report specifically on September 19, 2016.