Duplicate copies of SSRS report being delivered to subscriber - reporting-services

Question

Several SSRS subscribers are receiving duplicate copies of reports
Confirmed there are not multiple subscriptions
NA
I expect delivery of a single copy of the SSRS report to the subscriber

Answer 1

You could query the execution log to ascertain if there are any hidden executions of the report. Here is a script I use to achieve a similar thing.
Connect to your report server database, or your sharepoint integrated version whichever applies.
WITH subscriptionXmL
AS
(SELECT
SubscriptionID, OwnerID, Report_OID, Locale, InactiveFlags,
ExtensionSettings, CONVERT(XML, ExtensionSettings) AS ExtensionSettingsXML,
ModifiedByID, ModifiedDate, Description, LastStatus, EventType, MatchData,
LastRunTime, Parameters, DeliveryExtension, Version
FROM dbo.Subscriptions
),
-- Get the settings as pairs
SettingsCTE
AS
(SELECT
SubscriptionID ,
ExtensionSettings ,
-- include other fields if you need them.
ISNULL(Settings.value('(./*:Name/text())[1]', 'nvarchar(1024)'), 'Value') AS SettingName,
Settings.value('(./*:Value/text())[1]', 'nvarchar(max)') AS SettingValue,
Report_OID, LastRunTime, LastStatus, InactiveFlags
FROM
subscriptionXmL
CROSS APPLY subscriptionXmL.ExtensionSettingsXML.nodes('//*:ParameterValue') Queries ( Settings ))
select distinct
ssrs.name,
ssrs.Path,
--convert(varchar(max),ReportQry) ReportQry,
[LastExec] [SQL Last Executed],
subs.SettingName,
subs.SettingValue [Recipients],
InactiveFlags
from
(SELECT top (100) percent Name,
CAST(CAST(Content AS VARBINARY(MAX)) AS XML) AS ReportQry,
ItemID [Report_ID],
Path
FROM dbo.Catalog c
) ssrs
-- grab the last executed date
left join (select max(TimeStart) [LastExec], ReportID from ExecutionLog ex group by ReportID)ex
on ssrs.[Report_ID] = ex.ReportID
left join (
SELECT *
FROM
(select dbo.Catalog.Name, SettingsCTE.SubscriptionID, SettingsCTE.SettingName, SettingValue, LastRunTime, LastStatus, Report_OID, InactiveFlags
FROM
SettingsCTE JOIN dbo.Catalog on SettingsCTE.Report_OID = dbo.Catalog.ItemID
WHERE
settingName IN ( 'TO', 'CC', 'BCC' )
AND SettingValue IS NOT NULL
) subs
)subs
on ssrs.Report_ID = subs.Report_OID
where
-- filter down to a report that references a particular object name
(convert(varchar(max),ReportQry) LIKE '%you object / table / view%')
-- or filter down to an individual report
OR ssrs.name like '%your repot name%'