There was a bug affecting insightsPages_pivoted and insightsPosts_pivoted configurations for pages or posts with no values in some metrics. Under certain situations the zero value was replaced with the value of 1.
To fix any affected data you can run the extractor with parameters to backfill a given period of time, eg.
{
"since":"2012-01-01",
"until":"2015-12-10"
}
Put these parameters in your orchestrator configuration or use a separate API call to create a job.
We're sorry for this bug and for any trouble caused, read more about Facebook Insights Extractor for additional info.