Seeing Attribution Results with default values

Some search ads attribution requests are returning dictionaries with default values. What is going on here? We are also still seeing 'normal' attribution results as well.

{u'Version3.1': {
  u'iad-creative-id': u'1234567890',
  u'iad-campaign-id': u'1234567890',
  u'iad-org-name': u'OrgName',
  u'iad-lineitem-name': u'LineName',
  u'iad-keyword': u'Keyword',
  u'iad-lineitem-id': u'1234567890',
  u'iad-conversion-date': u'2018-08-29T09:05:52Z',
  u'iad-click-date': u'2018-08-29T09:05:52Z',
  u'iad-campaign-name': u'CampaignName',
  u'iad-attribution': u'true',
  u'iad-creative-name': u'CreativeName',
  u'iad-adgroup-name': u'AdGroupName',
  u'iad-adgroup-id': u'1234567890'
}