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It is most likely due to the way caching is set up on ask.fedoraproject.org. This site and askfedora run the same software (maybe versions are a little different) and here we don't have this issue.
Some days ago we resolved one particularly noticeable caching issue as described here http://askbot.org/en/question/631/askbot-and-memcached. Is this issue different? Do you have changes in the puppet deployment script where those middlewares are removed (as shown in the linked post)?