Unless this is intentional, I think CSS (possibly except bold/italics?) should be filtered from DISPLAYTITLE on user pages, or the magic word should be ignored on user pages, since it disrupts the layout of the page.
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It is intentional, but I agree it looks a little off here. We could only show the display title for the mainspace, but there's no 100% guarantee it will be absent of CSS there either. Instead I think we should enforce a font-size:inherit, that way it at least won't throw off the display.