It's a flaw in the way they've constructed the site. I just compared one of my sites with theirs, and my site automatically gets a sideways scroll bar - theirs doesn't.
Whether they wish to modify their site is, of course, entirely down to them.
I would have thought they would want to correct such a basic flaw, which shows up in other circumstances too (like putting their page into a window narrower than the page width - it might even show up on monitors with lower resolutions (though I can't quickly check that) - which would be very poor).
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