Legend patch color changes when hgexport

Hi I have manually changed patch colors in the legend to suit my preferences, but when I run hgexport at the end to export the file into .eps, the colors switch back. I am using a function called 'plotBarStackGroups'

plotBarStackGroups(d(:,:,1:15),{1:6}) %Function for plotting grouped and stack bar charts (3-d dataset
lg=legend('a','b','c','location','northwest'); % Create legend
lgp=findobj(lg,'type','patch'); %Find the legend patches (only 3)
cm=[0 1 0; 0 0.8 1; 0 0 1]; % define Colors
set(lgp(1),'facecolor',cm(1,:)); %Manually change the patch colors
set(lgp(2),'facecolor',cm(2,:));
set(lgp(3),'facecolor',cm(3,:));

hgexport(gcf,'fig.eps') % Export figure into .eps

To be noted, is that the switch back also occurred previously, when I had used the command:

set(gca,'fontsize',11)

To resolve this I moved this command above the color switch, but obviously cannot do this with the export function! Many thanks