Admin CP -> vBulletin Options -> Server Settings and Optimization Options -> Update Thread Views Immediately
Try setting it to update immediately.
If it isn't set to update immediately then maybe there is a problem with the scheduled task. Sometimes the tasks don't run for a variety of reasons. Check the task in your:
Admin CP -> Scheduled Tasks -> Scheduled Task Manager -> Thread Views
If the task has been running then the "Next Time" should be within the next hour. If the "Next Time" is in the past then it hasn't been running. In that case you need to make sure your footer template contains this code:
Code:
<!-- Do not remove $cronimage or your scheduled tasks will cease to function --> $cronimage <!-- Do not remove $cronimage or your scheduled tasks will cease to function -->
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