4 answers
Can you post screenshots of the Report, the Report Type, and the Filters, and Settings that you're currently using and the results you're getting? (for questions related to Analytics: Reports and Dashboards those are really helpful).
There are basically 3 reasons why something doesn't show up in a Report or Dashboard:
1. It does not meet the scope or filter criteria of the Report
2. The User does not have at least Read access to it
3. It does not exist