m_pcolor problem in m_map toolkit

1.Problem Description

When I use the m_pcolor function to draw two-dimensional latitude and longitude non-uniform grid data, there will be no data displayed on the left side of the image (as shown by the red circle in Figure 1). But when I use the pcolor function to draw, there is no such problem（Figure 2）. I tried to adjust the m_pcolor function, but the gains were very small.

2.code

clc;clear;close all;

figure(1)

set(gcf,'color','w');

load('new_thremap.mat');

load('nlat.mat');

load('nlon.mat');

load('pp.mat');

m_proj('miller','lon',[96 119],'lat',[10 29]);%mercator miller lambert oblique

m_pcolor(nlon,nlat,pp);

colormap(nclcmap(5,0));

hold on

m_plot([inborder(:).X],[inborder(:).Y],'color',[0.2,0.2,0.2],'linewidth',1);

m_grid('linewi',1,'tickdir','in','linestyle','none','FontSize',12);

colorbar;

figure(2)

set(gcf,'color','w');

mymap=pcolor(nlon,nlat,pp);

mymap.EdgeAlpha=0;

colormap(nclcmap(5,0));

hold on

plot([inborder(:).X],[inborder(:).Y],'color',[0.2,0.2,0.2],'linewidth',1);

xlim([96,119]);

ylim([10,29]);

box on;

set(gca,'TickLength',[0.02 0],'Linewidth',1.25,'FontSize',12,'FontName','Arial');

ylabel('Latitude(°)','FontSize',12,'FontName','Arial');

xlabel('Longitude(°)','FontSize',12,'FontName','Arial');

set(gca,'YTick',12:4:28);

set(gca,'XTick',100:5:115);

colorbar;

set(gca,'Layer','top');

3.attachment is data