Expanding or collapsing the last section of the FAQ ("How do I search?") sends you back up to the top of the page, while the other sections expand nicely without jumping around the page.
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The problem is that there are two HTML tags that use the same CSS ID ("search"). This should be fixed the next time they deploy.
The revision for which I reported the bug is 2011.8.24.3; until the revision is that, the issue should still be present.