It’s probably a browser-specific kerning issue, because it’s the same font. Actually it looks like both camps do it wrong: Chrome et alii would look better if the Y was closer to the preceding period, and the Microsoft bunch have a little too much space between the Y and the period following it.
Anyway there is not much you or MusicBrainz could do to fix this. An altogether different font may have better kerning, and I think the font used on MusicBrainz is rather ugly anyway. You can change a website’s font with the Stylish addon for Firefox.