New Post: Why is the cell data duplicated in each column?

mysql_fetch_array($roster_result)

This return a array with string keys (fields name) AND numeric keys. Use MYSQL_ASSOC or MYSQL_NUM as 2nd param, not the default MYSQL_BOTH.
With MYSQL_ASSOC, you have the names for yours column headers...

Note : MySQL extension isn't recommended for writing new code.