Surface Does Not Appear to be Correct

My surface doesn't look right, but I know I've entered the information correctly. What should I check?

If you are absolutely positive that the surface information is correct, the cause is most likely due to visualization settings.  Try increasing the tessellation (decreasing the tessellation scale size) for the selected entities.  For more information on the visualization attributes, please see FRED’s Online Help topic entitled “Visualization Attributes”.