Hand modification to catch basin produces the same spread output value

Good morning. We have placed a catchment by picking points. We analyzed our intake spacing by checking the spread report. The spread value was too high. We then modified the catchment, by hand, and spaced the intakes closer together to come up with a lower spread value. We reanalyzed and checked the spread report. The spread value computed did not change. Does the program not recognize manual modifications to catchments? Do we need to synchronize the drawing before reanalyzing? Thanks for any help that can be sent our way.