Unexpected field in Mysql fetch data-Collection of common programming errors

I have a query in which the data is lifted from the database. Eg: I have Category as a field which has values like Doctors, Pathologists etc which is taken from the database.

 Category
 --------
 Doctors
 Pathologists
 Pediatrics/Child Specialist --->> Unwanted data

The problem is there is a data(value) in ‘Category’ field which is unexpectedly showing in the list which is not in my database. I even tried to drop the table entirely and reload it but that field is still showing.

Can anyone tell me why is this happening?

Additional Info

function  getTierCategory()
{
echo "
";
$result = mysql_query("SELECT DISTINCT Category FROM doctors order by Category asc") 
or die(mysql_error());

  while($tier = mysql_fetch_array( $result )) 

    {
       echo ''.$tier['Category'].'';
    }

}

I have tried renaming the field but how can I if this value is not even in my database.

My Database looks like

Category | Qualification | State  | District
--------------------------------------------

and so on