what is the correct format for the csv file? after import it shows one user with over 1000 entries

what is the correct format for the csv file? after import it shows one user with over 1000 entries

not sure how is the format for the csv and also when i import the file it shows the same user over 1000 times. we created a formula in excel for the first user and then expand it to all of them. somehow ad manager shows only the first user over a thousand times.
any clues?
my format is:
given name, last name, pwdlast set, display name, user logon name

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