We have a report that is showing tasks on accounts.
For the most part is shows only those tasks which a sales person should see as expected according to sharing rules...
However one of my users can see some tasks owned by other people on other peoples accounts: (some is key - not all) S1, S2 and ISR.
ISR has task on S1's account. The report shows this to S2 S2 has no child object items (opportunities, tasks, contracts, contacts etc) on this account.
Sharing settings for Activites are Private. For accounts and contacts they are private but with rules to share sideways from Sales hierarchy to Sales Enablement hierarchy (but not the other way)
When I sign in as the user and click into the items that are shown in the report (Contact, Account, Task) the links for Acc and Cont are prohibited for the user but the task is visible.
If I'm missing something - I will answer questions... I cannot see the issue.