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The address those links take you to ends with .html (unanswered.html for example) so you are probably usage some sort of static site caching system. If this isn't working right or did not properly generate the .html files those links will not work when a user clicks on them.
Since this is a relatively low traffic forum try disabling website caching. It will slightly increase your server load but will fix your problem. If the forum starts getting really popular and you need to conserve on server resources you can always re-enable it.
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