I have configured a MODFLOW model in GMS, using the conceptual model approach. During the configuration I chose to setup the model with a 3d grid, to get a uniform grid throughout the layers. However, for some unknown reason, the 1st layer has more cells than the underlying layers (as seen in the picture, showing the model in front-view). Is there anyway to fix this without having to setup an entire new grid, and how do I avoid this issue in the future?