Importing Issue

We are having trouble importing a contact database. Someone from my team inadvertently deleted our database and we would like to import a backup data file. We have a recent version of a .CSV file that was exported using the plugin itself and we would like to import it as backup. The .CSV file contains about 900 records, and whenever we attempt to import the file, we receive a confirmation message that 900 rows were processed. However, when we go into the Contact Form DB, there are only about 90 records listed. Furthermore, the data for some of the records are also not aligned.