Okay, I've had this happen before and never found a reliable solution...

After running a Flow simulation I'm making surface plots, but sometimes it chooses random surfaces.

As you can see, I selected all of those faces on this part, but when you hit okay and let it plot it... It doesn't use those surfaces, it chooses others.  Go back to edit it and it highlights the ones I selected.  It's like Flow gets confused on its labeling or something.

Anybody ever found a reliable solution (and no, use all faces is not an option with the size of this model and enclosed parts).  It is only affecting a few of the configurations in this assembly which makes it all the more confusing.

(and it's not just surface plots, surface parameters have similar issues in this configuration, selecting a solid surface and asking for parameters can give meaningless answers or even errors.)