MATLAB export figure to .png changes size after export

In my script I create about 30 figures which are automatically saved as MATLAB .fig and as .png. For my report I sometimes need to change the aspect ratio (instead of the standard 900x900 pixels, I want to have 1600x1000). That is why I save them as .fig as well. Once opening one of these figs I go to export setup and change the size in width and height in points. I press aplly and export as png. However once I look back at my figure it has suddenly become 1924x1007. I have no clue where this is coming from.

I hereby include my figure saving procedure, though I doubt this should have any effect:

amountFigures =  findobj('type','figure');
for k = 1:length(amountFigures)
    set(figure(k),'PaperPosition',[0 0 (900/300)/0.393701 (900/300)/0.393701]); %Sets a high quality output to the image               
    set(findobj(gcf,'type','axes'),'FontSize',14); %A bigger fontsize is needed for better readability
    hline = findobj(gcf, 'type', 'line');
    set(hline,'Linewidth',2);
    temp = get(gca);
    titel = temp.Title.String;
    temp.Title.String = [];
    savefig([titel,'.fig'])
    print(gcf,'-dpng','-r300',[titel]);   %Saves the figures with the titel name. 
    close(figure(k))
end

[Fernon Ejikhoudt]

Soo, an update: if I would set it to centimeters and use 23.8 cm, it gives me exactly 900 pixels and 39.68 is 1500 pixels (1 pixel ~ 0.02645). This works, but it is still no excuse for the change in size when 'points' is selected instead of centimeters.