plotter.distrib_attributes2d() - small issue

The function plotter.distrib_attributes2d()

When I call this function like this, it outputs the plot twice. This should not be the case here, I guess. plotter.distrib_attributes2d(block='performance_attributes', attributes=['M_y/M_Rd','V_z/V_Rd'] )

Additional Comment: Instead of having this 45 degree line in the diagonal of the matrix, I would suggest to change it to a histogram of that dimension.