There are two settings that are applicable. The first is in the Query Panel Properties: Retrieve Duplicate Rows
; this should be checked (it is by default).
The second setting is in the report block properties. Right-click on the border around the report block and click Format
. This will bring up the Properties panel for the report block. Under the "Display" header you should see a setting for Avoid duplicate row aggregation
(which is off by default). Click it, and you should see your duplicate rows.