Discrepancy in Field Values

What is the discrepancy between the field minimum/maximum and evaluation of a field quantity at a point in the same location?

When evaluating field minimum/maximum in the fields calculator, Maxwell software first utilizes the smooth function, then evaluates the location and value of the field maximum/minimum. Creating a point in the same position and evaluating fields at the point will lead to different results because the smooth function is used. This is a numerical error and decreases as the mesh is improved.