View counters are updated hourly by this cron:
Admin CP -> Tools -> Cron Entries -> Update View Counters
You can run it manually or wait.
The Forum Statistics on the front page is updated every 10 minutes by a cron. You can force it to update by manually running the cron:
Admin CP -> Tools -> Cron Entries -> Rebuild Board Totals Counter -> Controls: Run
Note that it excludes invalid users (banned or awaiting email confirmation or moderation).