When querying the Enforce console for a summary of incidents by Policy Label, the initial query shows a number of incidents, but when you click on the hyperlink for the policy label, the result is blank. No incidents are displayed.
DLP 16.0.x
Check the policy label and make sure there is not a trailing space at the end of the label.
Once the trailing label is removed, perform the query again and you should be able to see all of the incidents.