Geological-time Enhancement is a very powerful plug, but when it’s active and I generated an very high resolution maps (>3m/pix) many square shape appears ,
we can see it with max zoom in layout view , they are add in height maps.
Layout view isn’t representative here.
Usually straight edges in the results of erosion are far more subtle and can be dealt with applying mild displacement afterwards (which is in general a nice trick that improves the look of eroded terrains).