Flowgraph bug?

When using a ConnectionPoint of type xtpFlowGraphPointInputAndOutput the connection (the line) will shift from the input point to the output point depending on the connecting node placement on the chart.

I don't know if this is by design, but it would seem that the output or input should always be fixed to the output side or input side depending on where the user positions the line. Also note that both the output and input side will highlight indicating a connection. Illustrations:






If this is by design, is there a way to change the behavior so the connection doesn't float from input to output? Can point highlighting apply only to the input side or output side of the connection and not both?