An explanation of surface goals is needed

Hi,

  I'm modeling an array of nozzles, and as a calculation control, I selected Max Velocity on a surface.  I thought this was working well, but I guess I was fooled. When I run the solver with the Goal Plot window, it shows me that the current value of the velocity at that surface is zero, but the preview window clearly shows a non-zero value.

  See below for the picture that is hopefully worth more than my words...

Do I have a fundamental misunderstanding of how a surface goal should work?

SolidworksFlow Simulation