Deleting terms does not delete theirs metas

A little late, but you can do the following:

– Open the simple-terms-meta.php in an text editor
– Insert the following code in the end of the file:

do_action( 'delete_term', 'simple_term_metas_delete_term',10,4 );
function simple_term_metas_delete_term($term, $tt_id, $taxonomy, $deleted_term) {
	global $wpdb;
	$wpdb->delete($wpdb->termmeta, array( 'term_id' => $term ));
}

– This code hooks the “Delete Term” Action and deletes all meta rows that are associated to the term.

Regards,
impuls-wa