Different heatmaps using different visulization parmeters

[KaWingLee9]

x is a diagonal matrix, When I tried to plot heatmaps:

Heatmap(x,show_row_names=FALSE,show_column_names=FALSE) Heatmap(x,row_split=25,show_row_names=FALSE,show_column_names=FALSE) Heatmap(x,row_split=25,column_split=25,show_row_names=FALSE,show_column_names=FALSE)

Different heatmaps shown using different codes. How to solve the wierd result as in the second plot?