They seem to be correct to me. The reason why you're getting a different result in VI Errors1.vi is because the position of the plot is different. If you set the position of the plot to be the same as VI Works1.vi, then the results will be the same. Perhaps you want to use Plot Area:Size:Height instead of Plot Area Bounds.
Regards,
Stanley Hu
National Instruments
Applications Engineering
http://www.ni.com/support