Get rid of repeat Birthdays on "Birthday Calendar (Read Only)"

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http://androidforums.com – On my calendar app (just the preinstalled one on the phone) I have a contact that has their Birthday listed three times on the same day. One is my facebook birthday calendar and two that say are from "Birthday Calendar (Read Only)" I know I can use the menu at the top to check which calendars show up I was just wondering how to get rid of the two extras. In my people the contact is only listed once with just their number in the info and then its synced with their facebook contact from the htc facebook app. Why are their two extras on the read only birthday calendar and how can I rem (General)