That full-screen capture is from a laptop with a 15" dialog screen. Resizing any window on the same hardware should never affect the style (font size, layout proportions, etc.). It doesn’t on every other website I’ve seen, save some flash-movie pages. Websites that are “aware” of screen sizes, grab that information for formatting (if formatting is to be different on different devices). Browser-size information is useless because it gives no indication of the device it’s on.
But this does happen here, meaning the wrong information is being requested, for ID, for style/format. Also, there must be a default (a “standard” webpage) to fall back on if such information is not available or not accounted for. So that might be wrong, too.
These are real bugs. They must be squashed. Do Your Part !