I think this may be related to factors such as screen resolution and possibly dots per inch. If I browse the example on my iPad Mini (1024 * 768 resolution) I have a slightly different layout to using Internet Explorer 11 (1920 * 1080 resolution) though neither has the issue you are experiencing.
I have attached a snippet from IE to show that it looks okay for me.
As far as I am aware there is no requirement to install a specific font.
174200.JPG 31.2 K
Rod, thank you for the pointer.
I tried Firefox in OSX and got a good result. Then I tried IE in Win8.1 and got a good result (like yours).
Finally, I tried Firefox in Win8.1, my usual browser, and got the result I posted at the start of this thread. Looks like the problem might be with Firefox on Windows.