<?php
$prefix = 'faith_ad_';

$meta_box = array(
    'id' => 'faith_ad-meta-box1',
    'title' => 'Vendor Info',
    'page' => 'vendors',
    'context' => 'normal',
    'priority' => 'high',
    'fields' => array(
        array(
            'name' => 'Link',
            'desc' => 'Enter the full URL to this vendor\'s website including the http://.',
            'id' => $prefix . 'vendor_link',
            'type' => 'text'
        ),
		array(
            'name' => 'PDF',
            'desc' => 'Enter the full URL to the PDF for this vendor. You may upload it using the Media uploader on the top left.',
            'id' => $prefix . 'pdf_link',
            'type' => 'text'
        )
    )
);

$meta_box = array(
    'id' => 'faith_ad-meta-box2',
    'title' => 'Slide Info',
    'page' => 'slides',
    'context' => 'normal',
    'priority' => 'high',
    'fields' => array(
        array(
            'name' => 'Learn More Link',
            'desc' => 'Enter the link to where you would like this slide to link to, if anywhere.',
            'id' => $prefix . 'slide_link',
            'type' => 'text'
        ),
    )
);

$meta_box = array(
    'id' => 'faith_ad-meta-box3',
    'title' => 'Testimonial Info',
    'page' => 'testimonials',
    'context' => 'normal',
    'priority' => 'high',
    'fields' => array(
        array(
            'name' => 'Organization',
            'desc' => 'Enter the name of the organiztion this person is part of. ',
            'id' => $prefix . 'testimonial_organization',
            'type' => 'text'
        ),
		array(
            'name' => 'Location',
            'id' => $prefix . 'testimonial_location',
            'type' => 'text'
        )
    )
);

add_action('admin_menu', 'faith_ad_add_box');

// Add meta box
function faith_ad_add_box() {
    global $meta_box;
    
    add_meta_box($meta_box['id'], $meta_box['title'], 'faith_ad_show_box', $meta_box['page'], $meta_box['context'], $meta_box['priority']);
}

// Callback function to show fields in meta box
function faith_ad_show_box() {
    global $meta_box, $post;
    
    // Use nonce for verification
    echo '<input type="hidden" name="mytheme_meta_box_nonce" value="', wp_create_nonce(basename(__FILE__)), '" />';
    
    echo '<TABLE class="w3-table w3-striped w3-bordered w3-border w3-white" class="form-table">';

    foreach ($meta_box['fields'] as $field) {
        // get current post meta data
        $meta = get_post_meta($post->ID, $field['id'], true);
        
        echo '<tr>',
                '<th style="width:140px;"><label for="', $field['id'], '">', $field['name'], '</label></th>',
                '<td>';
        switch ($field['type']) {
            case 'text':
                echo '<input type="text" name="', $field['id'], '" id="', $field['id'], '" value="', $meta ? $meta : $field['std'], '" size="30" style="width:97%" />', '<br />', $field['desc'];
                break;
        }
        echo     '<td>',
            '</tr>';
    }
    
    echo '</table>';
}


add_action('save_post', 'faith_ad_save_data');

// Save data from meta box
function faith_ad_save_data($post_id) {
    global $meta_box;
    
    // verify nonce
    if (!wp_verify_nonce($_POST['mytheme_meta_box_nonce'], basename(__FILE__))) {
        return $post_id;
    }

    // check autosave
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
        return $post_id;
    }

    // check permissions
    if ('page' == $_POST['post_type']) {
        if (!current_user_can('edit_page', $post_id)) {
            return $post_id;
        }
    } elseif (!current_user_can('edit_post', $post_id)) {
        return $post_id;
    }
    
    foreach ($meta_box['fields'] as $field) {
        $old = get_post_meta($post_id, $field['id'], true);
        $new = $_POST[$field['id']];
		
		//echo '<Br />new: '.$new;
		//echo '<Br />old: '.$old;
        
        if (strlen($new) > 0 && $new != $old) {
			//echo '<Br />update'.$field['id'].$new;
            update_post_meta($post_id, $field['id'], $new);
        } elseif ('' == $new && $old) {
            delete_post_meta($post_id, $field['id'], $old);
        }
    }
	//exit;
}
?>

Solution - 1

You should be calling out

'custom_post_type'

'page'

$meta_box_one = ...
$meta_box_two = ...
$meta_box_three = ...

add_action('admin_menu', 'faith_ad_add_box');