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//* Put these in functions.php

/**
 * Description: This redirects the failed login to the custom login page instead of default login page with a modified url
 * @link ttp://wordpress.stackexchange.com/questions/110094/custom-login-redirects-to-wp-admin-on-wrong-password
**/
add_action( 'wp_login_failed', 'prefix_front_end_login_fail' );
function prefix_front_end_login_fail( $username ) {

	// Getting URL of the login page
	$referrer = $_SERVER['HTTP_REFERER'];
	// if there's a valid referrer, and it's not the default log-in screen
	if( !empty( $referrer ) && !strstr( $referrer,'wp-login' ) && !strstr( $referrer,'wp-admin' ) ) {
	    wp_redirect( $referrer . "?login=failed" );
	    exit;
	}
}

/**
 * Description: This redirects to the custom login page if user name or password is empty with a modified url
 * @link ttp://wordpress.stackexchange.com/questions/110094/custom-login-redirects-to-wp-admin-on-wrong-password
**/
add_action( 'authenticate', 'prefix_check_username_password', 1, 3);
function prefix_check_username_password( $login, $username, $password ) {

	// Getting URL of the login page
	$referrer = $_SERVER['HTTP_REFERER'];

	// if there's a valid referrer, and it's not the default log-in screen
	if( !empty( $referrer ) && !strstr( $referrer,'wp-login' ) && !strstr( $referrer,'wp-admin' ) ) {
	    if( $username == "" || $password == "" ){
	        wp_redirect( $referrer . "?login=empty" );
	        exit;
	    }
	}

}

//* Put this in your login page template

/*
 * Show login page with errors when fail
 * @link ttp://wordpress.stackexchange.com/questions/110094/custom-login-redirects-to-wp-admin-on-wrong-password
 */
add_action( 'genesis_entry_content', 'prefix_do_login_form' );
function prefix_do_login_form() {
	if ( is_user_logged_in() ) {
		echo '<span style="display:block;text-align:center;">You are logged in.</span>';
	} else {


	    if ( isset( $_GET['login'] ) && $_GET['login'] == 'failed' ) {
	        echo '<div class="wp_login_error">';
	        	echo '<p>The password you entered is incorrect, Please try again.</p>';
	        echo '</div>';
	    } elseif ( isset( $_GET['login'] ) && $_GET['login'] == 'empty' ) {
	        echo '<div class="wp_login_error">';
		        echo '<p>Please enter both username and password.</p>';
			echo '</div>';
	    }

		$args = array(
	        'echo'           => true,
	        'redirect'       => site_url( $_SERVER['REQUEST_URI'] ),
	        'form_id'        => 'loginform',
	        'label_username' => __( 'Username' ),
	        'label_password' => __( 'Password' ),
	        'label_remember' => __( 'Remember Me' ),
	        'label_log_in'   => __( 'Log In' ),
	        'id_username'    => 'user_login',
	        'id_password'    => 'user_pass',
	        'id_remember'    => 'rememberme',
	        'id_submit'      => 'wp-submit',
	        'remember'       => true,
	        'value_username' => NULL,
	        'value_remember' => false
		);
		wp_login_form( $args );
	}
}

//* To redirect the WP login page use this https://gist.github.com/JiveDig/adedc27cc2d9320ce6de