Outlook 2003 keeps importing duplicates into Contacts from a .csv file

Please help! Everytime I import contacts via .csv file, Outlook creates duplicates in Contacts. I have not edited the .csv file and attempted this task four consecutive times in a few different ways. This has resulted in four of each contact.
“Check for duplicate contacts” is checked in the Contact Options.
I have tried it by checking off “Replace duplicates with items imported.”
I have also tried it by checking off “Do not import duplicate items.”
I spent half of yesterday searching Google with describing different variations of my problem with the hopes of finding just that one link of a possible solution. Please help.
Thanks,
Dean