If you are seeing duplicate data on logs and fences, on the Configuration tab, check the box Distinct records from each table.
You do not want to set this property in all cases with <<Depth>> in the Depth Expression and multiple tables. Most of the time the native behavior is what is desired. Only mark this in cases with inappropriate data duplication.
If you are seeing duplicate data on graphs, on the Independent Data tab, check Distinct records from each table (PointID,Depth only). This property is available in version 8.2 and later. It forces the decoupling of data from multiple tables so that they output at their specific depths. This applies only to Graph reports with a key set of "PointID,Depth". It is rare that you need this option but it is possible that with output of data from extended key set PointID,Depth tables, where the key sets are different, you could get data points plotting redundantly. If that occurs, mark this property.