No, it's not a bug.
Perhaps you inadvertently ran install.php instead of upgrade.php.
However this is not a support section, this is for pre-sales questions only. If you need support please post in a different forum. Ideally you would ask your questions in the support forums on vBulletin.com.
You should restore your backup and try the upgrade again. Make sure you run upgrade.php and not install.php.
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