RectangleNew_BN plots improperly on a multi-datastream chart

I noticed that when applying an indicator that draws rectangles to data2 of a multiple datastream chart, the starting bar of the rectangle was incorrect. I received no feedback from the Discussion Forum issue that I raised, so I coded an indicator that uses RectangleNew_BN and TL_New_BN to plot objects simultaneously to show the difference between the trend line plot (works properly) and the rectangle plot (plot wrong).

I have sent Henry a workspace which contains two charts, both with two datastreams: Chart 1)the 10 point is Data1 and the 5 point is Data2 and Chart 2) the 5 point is Data1 and the 10 point is Data2. The same indicator (PLA also sent to Henry) with the same settings is applied to both charts and in both cases the indicator is set to be based on the 10 point datastream.

The indicator plots correctly on Chart 1 and incorrectly on Chart 2.