Detailed Report not showing all activities owned by user

Hi,

Our requirement was to create a report that shows number of activities by status and every user must see their own activities' count. It has been achieved succesfully. 

We also want that when a user drills down to a particular status then user should be able to see all his activities having the selected status. 

Expected fields to be displayed are: Status, Type, Subject, Priority, Created Date, Due Date, Account Name, Contact Full Name. 

Problem faced is that when a user drills down to a particular status then Answer shows 'No Result'. But when Contact Full Name is removed, the report shows correct result for all the activities with their respective Account Name.