encoding problem

Hi guys.

There are problems with the encoding.
Trying to create a plug-in to the admin panel to it. The problem is that when you add data through a plug-in MySql appear “???????????”.

Encoding Server have

AddDefaultCharset utf-8

Edncoding DB server

UTF-8 Unicode (utf8)

encoding table:

InnoDB	latin1_swedish_ci

encoding other tables:

InnoDB	utf8_general_ci
InnoDB	utf8mb4_unicode_ci

To specify the encoding when you create a database table?

this creates a table:

function create_table() {
    global $wpdb;

    $table_name = $wpdb->prefix . "services";
    if ($wpdb->get_var("SHOW TABLES LIKE '$table_name'") != $table_name) {
        $sql = "CREATE TABLE " . $table_name . " (
	  id mediumint(9) NOT NULL AUTO_INCREMENT,
	  time bigint(11) DEFAULT '0' NOT NULL,
	  name tinytext NOT NULL,
	  text text NOT NULL,
	  url VARCHAR(55) NOT NULL,
	  UNIQUE KEY id (id)
	);";

        require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
        dbDelta($sql);
    }
}

this insert to table:

function insert_services() {
    if (isset($_POST['add_service'])) {
        global $wpdb;
        var_dump($_POST);
        $table_name = $wpdb->prefix . "services";
        $services_name = $_POST['service_name'];
        $services_text = $_POST['service_text'];
        $rows_affected = $wpdb->insert($table_name, array('time' => current_time('mysql'), 'name' => $services_name, 'text' => $services_text));
    }
}

sorry for my English