Extra data from Agilent N99XX Series Analyzer PnP Driver

I'm having an odd issue with the "Read NA Trace Data.vi" inside this part of the Plug-and-Play driver set.  

For whatever reasons, this function is pulling two "sets" of data points, every time I call the function.   So in my application space, I'm doing a 401-point data dump.....but this function returns 802 data points (Capture.PNG).

Any thoughts?   I did not write this VI, used it as-is straight off the NI website.    Thanks,