exact matches KeywordTextMatchingQuery dont have [] within the downloaded file

I am downloading the search performance report and everything seems fine except that there are no "[]" within the field KeywordTextMatchingQuery for exact matches. Is there anything different between API and manual UI download report?  I see those within the report if I download it from the UI.

SEARCH_PERFORMANCE_REPORT_30DAY = {
    'reportName': 'Yesterday search performance report',
    'dateRangeType': 'CUSTOM_DATE',
    'reportType': 'SEARCH_QUERY_PERFORMANCE_REPORT',
    'downloadFormat': 'CSV',
    'selector': {
        'dateRange': {'min':'20160717','max':'20160717'},
        'fields': [
            'AccountDescriptiveName',  # account
            'Date',  # time_stamp
            'Query',  # query
            'QueryMatchTypeWithVariant',  # match_type
            'AdGroupName',  # ad_group
            'CampaignName',  # campaign
            'KeywordTextMatchingQuery',  # keyword_text
            'Clicks',  # click
            'Impressions',  # impression
            'Cost',  # cost
            'Conversions',  # conversion
        ]
    }
}

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