Crosslist DFWP showing non-admins double items for one part of linked data source

Question

I have a crosslist Data Form Web Part whose data source is a linked source. For non-site admins with any level of permissions on the page, the data form displays doubles of items from one of the linked lists, but not the others. For admins, it displays one item per list item (as is intended).

What might be going wrong here?

CAML:

<View>
    <Webs Scope="Recursive"></Webs>
    <Lists ServerTemplate="101"></Lists>
    <Query>
        <Where>
            <Eq>
                <FieldRef Name="Department"/>
                <Value Type="String">Copyright</Value>
            </Eq>
         </Where>
         <OrderBy>
             <FieldRef Name="Title" Ascending="TRUE"/>
         </OrderBy>
    </Query>
    <ViewFields>
        <FieldRef Name="ID"/>
        <FieldRef Name="BaseName"/>
        <FieldRef Name="FileLeafRef"/>
        <FieldRef Name="LinkFilename"/>
        <FieldRef Name="LinkFilename2"/>
        <FieldRef Name="LinkFilenameNoMenu"/>
        <FieldRef Name="PermMask"/>
        <FieldRef Name="ParentLeafName"/>
        <FieldRef Name="_SourceUrl"/>
        <FieldRef Name="FileRef"/>
        <FieldRef Name="Title"/>
   </ViewFields>
</View>

Attempting to filter by department at the data source level results in an error when attempting to use the data source.