In the Users page (either the quarter view or year view), when I hover over Barrie England's rep, the popup shows the amount twice (along with the total rep):
In the week, month, or all views, or for other users, the popup is calculated correctly:
Before you sigh in disbelief at my pettifogging, check out the voters tab or the editors tab, in any view except all. Every single user has their total reputation no less than three identical times on the popup, even where it says it's the rep for the month or week or whatever:
Sigh all you want.
Edit: Hovering over Barrie's rep in the quarter view of the rep user tab still brings up a buggy popup:
Further edit: And now that's about to be fixed too.