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udhayakumar thangarajuudhayakumar thangaraju 

Opportunity reports showing all the records to all the users

As per my understanding Opportunity reports show the records based on the Role Hierarchy. It has been working fine until summer 15 release. Now all of sudden all the users seeing other records which they should not see. Has anyone encountered the similar issue? Was there any change in Salesforce platform which could have caused this issue?
SonamSonam (Salesforce Developers) 
Visibility of records in a report can also depend on the accessibility of these records to these users.

Did you make any changes in the Opportunity object Organization wide defaults? Or did you add any sharing rules or change any filters on these reports.
(Screenshot would help understand which report you are talking about.)