I checked into this for you and it turns out you have 3 different accounts associated with the same email address. It is likely that you have 2 of those accounts both on that team and subscribed to receive the emails. If you don't know what all the account usernames are, you can request that your username be sent to you by going to the login page at SparkPeople.com. There, click the link that says, "Forget your password?" If you enter your email address in that box, you will be sent an email with all your usernames and links to reset the passwords and log into the accounts.
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