The username on the comment does not match their current name. This shouldn't be a caching issue as they were last seen 8 hours ago (at time of writing).
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This is only a problem, because the user hasn't specified a name in his user page. Maybe he logged in using different email accounts for the question and the comment. Not sure, if it is possible to fix that.
I've edited the user's profile to achieve consistency - but yes, looks like a bug.