I'm trying to shade profiles of different measurements over depths and the colors look limited

I am using contourf to plot data overdepth. The first panel looks fine, but in the second it looks like only four colors are being used for some reason. I cannot figure out why this is the case. The individual data are different so it isn't just the same number repeated. Can anyone help me explain this? I have copied my script (below) and attached the relevant data.

f3=figure(3)

ax(1) = subplot(2,1,1)

hold on

contourf(MX,mabs,fixPCO2(2:8,:),'LineStyle','none')

contour(MX,mabs,fixPCO2(2:8,:),[1000 1000],'w','linewidth',1)

hold off

shading('interp');

ylabel('mab','fontsize',16);

caxis([350 1000]);

b=colorbar; colormap(ax(2),jet)

title(b,'pCO2','fontsize',16);

set(gca,'fontsize',16);

x = datenum('July-30-2018'):1:datenum('Aug-13-2018');

set(gca, 'XTick', x);

datetick('x','mm/dd','keepticks')

%set(gca,'XTickLabel','');

ax(2) = subplot(2,1,2)

hold on

contourf(MX,mabs,fixOMEGA(2:8,:),'LineStyle','none')

contour(MX,mabs,fixOMEGA(2:8,:),[1 1],'w','linewidth',1)

hold off

shading('interp');

ylabel('mab','fontsize',16);

caxis([.76 2.2]);

colormap(ax(3),flipud(jet))

set(gca,'fontsize',16);

c=colorbar();

title(c,'\Omega_A_r','fontsize',16);

x = datenum('July-30-2018'):1:datenum('Aug-13-2018');

set(gca, 'XTick', x);

datetick('x','mm/dd','keepticks')

linkaxes(ax,'x')

[Aghamarsh Varanasi]

Can you give more details on the variables used in this command

contourf(MX,mabs,fixPCO2(2:8,:),'LineStyle','none');