Problems with list search selection

Have the following on my page …

[pdb_list template=”pdb_list_detailed.php” search=”true” sort=”true” fields=”image,first_name,last_name,city,state,zip,phone,email,web_site,request” filter=”id=0&Is_Clown=Yes”]

I modified the php to look like this and placed in the wp themes directory …

* 4. sorting: you can choose to sort the list by ‘column’ (the order they
* appear in the table), ‘alpha’ (alphabetical order), or ‘order’ which
* uses the defined group/field order
*/
$this->column_selector( false, true, ‘city,state,zip’, ‘alpha’ );

But still all the fields display in the dropdown and not just the 3 above

What don’t I get?

https://wordpress.org/plugins/participants-database/