Repeatable fields returning value of 1 for delete values

Using the repeatable fields to select related posts and I’m finding that if I add a value and then delete it there are still values left in the DB and I’m then getting a ‘0’ returned when using the API call.

$related = simple_fields_values("related_portfolio_posts");
print_r($related);

Output – I should just get one value ‘463’ not ‘0’.
Array ( [0] => 463 [1] => 0 )

http://wordpress.org/extend/plugins/simple-fields/