How do I associate legend icons with the proper data?

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test2fig.png

Iâ€™m generating a plot containing 2 sets of data (data set 1 & data set 2)) using the following code;

h = plot(Pre_TALO_Time1, Pre_Altitude1, '-o', Post_TALO_Time1, Post_Altitude1, '-d', Pre_TALO_Time2, Pre_Altitude2, '-o',  Post_TALO_Time2, Post_Altitude2, '-d', 'MarkerSize', 15);
set(h(1), 'Color', 'r', 'MarkerFaceColor', 'r');
set(h(2), 'Color', 'r', 'MarkerFaceColor', 'r');
set(h(3), 'Color', 'b', 'MarkerFaceColor', 'b');
set(h(4), 'Color', 'b', 'MarkerFaceColor', 'b');
% Hold all current axes and connect the data sets
hold on;
xx = [Pre_TALO_Time1(end), Post_TALO_Time1(1)];
yy = [Pre_Altitude1(end), Post_Altitude1(1)];
plot(xx, yy, 'r-', 'LineWidth', 1);
hold on;
aa = [Pre_TALO_Time2(end), Post_TALO_Time2(1)];
bb = [Pre_Altitude2(end), Post_Altitude2(1)];
plot(aa, bb, 'b-', 'LineWidth', 1);
% Add the title, legend, and classification
title(Event_Title, 'Fontsize', 20, 'fontweight', 'b');
legend(Source1, Source2, 'Location', 'NortheastOutside');
set(legend, 'FontSize', 20);
Max_TALO_X_Values = [max(Pre_TALO_Time1) max(BO_TALO_Time1) max(Post_TALO_Time1) max(Pre_TALO_Time2) max(BO_TALO_Time2) max(Post_TALO_Time2)];
Max_TALO_X = max(Max_TALO_X_Values);
set(gca, 'XLim', [0 10*ceil(max(Max_TALO_X)/10)]);
Max_Y_Values = [max(Pre_Altitude1) max(BO_Altitude1) max(Post_Altitude1) max(Pre_Altitude2) max(BO_Altitude2) max(Post_Altitude2)];
Max_Y = max(Max_Y_Values);
set(gca, 'YLim', [0 10*ceil(max(Max_Y)/10)]);
set(gca, 'Fontsize', 16);
grid on;
box on;

The resulting plot is this;

The legend contains the correct icon proceeding 'data1'. However, the diamond icon proceeding 'data2' is not correct. It should be a blue circle with a line through it.

What could be causing this?