Duplicate records returned in SmartList Viewer

I am using the SmartList Viewer templates provided by Microsoft, this one is called Receivables transactions.  This SmartList shows only document types of return or credit memo, and I am showing the apply to document information on the SmartList.

When I run the report, it is showing duplicate rows, i.e. the same credit memo applied to the same document applied to the same amount for some of the transactions.  Does anyone know why this would happen or how I can prevent it from showing duplicates?

Thanks!