What did you selected to restore? ALL your tables? all your tables replacing the existing ones? all your tables adding prefixes with the old date?...
If you restored your db and don't selected to overwrite your current one... well you had your db + your old tables with prefix... what exactly where you attemping to get with mysql restore if it's refered to the recent hack on your site I sugest you to check for IFRAME strings on the main page (files) and well also on the DB... is an old attack on IBP... and others CMS.
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