The most likely cause is that the hook is probably running multiple times (e.g. once per meta field). You may need to qualify/filter your function like so…
add_action( 'added_post_meta', function ( $mid, $object_id, $meta_key, $_meta_value) {
global $wpdb;
if ( $meta_key != 'data19' ) {
return;
}
$table_name = $wpdb->prefix . 'postmeta';
$results = $wpdb->get_var(
"SELECT meta_value FROM " . $table_name .
" WHERE meta_key = 'data19' AND post_id = " .$object_id. " " );
}, 10, 4 );
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